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I have already made these 2 gifs in photoshop and exported them as videos (the ones below are gifs for illustration, I would recommend you to export them to videos for processing in after effects). Make sure they’re of the same length. I’m gonna call the first gif the base gif, and the second gif the top gif. I added the text in photoshop, you can totally do it in after effects as well. The font for the big text is Ciudad Podrida and for the small texts it’s Roboto Bold Condensed.

1. Importing files

1. Open a new project.

2. Import your files by either going to File → Import → File. Or simply drag you files into the Project panel.

3. Drag your files to the timeline panel.

2. Rotoscoping

1. Double click on the layer you would like to rotoscope to open the layer window. This is the window you will work on for the following steps.

2. Click the Roto Brush Tool to start rotoscoping.

(I have rearranged the layer and composition panel so it’s easier to view. The layer panel is the one on the left.)

3. Choose a frame where the object is seen (not covered) to start. And paint across the object. Here are some tips from adobe.

Start with one stroke that cuts across the object.

Don't draw an outline around the object. Draw through the middle, passing through any regions on the object that have different color or brightness.

Don't paint across edges as this can confuse the selection.

4. Go to Effect Controls panel and choose Best for Quality.

(I have added a white background for better illustration)

5. Add more paint strokes to select the entire object.

6. Alt+drag to paint over areas you would like to deselect from your selection.

7. Once you’re satisfied with you selection, hit spacebar to propagate your selection to all frames.

8. You can review the selection frame by frame to add or remove any selection.

9. To refine your selection, go to Roto Brush Matte in the Effect Controls panel.

Feather: It kinda rounds out your selection

Contrast: It determines how sharp the edges of your selection are. A lower contrast gives a more feathery effect to the selection.

Reduce Chatter: To reduce unwanted background that may have been selected by AE

The first gif is when the options are at their default values. The second gif is after I adjusted the values. This is a rough selection I just did. When the object has a lot of movement or has colours that are very similar to the background like this one. It’ll take a bit more time to refine the selection.

10. Once you’re satisfied with your selection. Hit freeze to freeze your roto brush selection.

This is what you should have now. I will then add a drop shadow and move the rotoscope to the side.

To add a drop shadow, go to Effects & Presets on the right and search for drop shadow. Drag the drop shadow preset to your top gif layer.

You can edit your drop shadow in the Effect Controls panel. Here’s my drop shadow settings for this gif.

To move the top gif to the right. Go to the timeline panel, click the little arrow on the left of your layer to open up the settings. Go to Transform → Position, and adjust the y-axis value.

3. Refine edge tool

Sometimes, when selecting hair/fur where the background is peeking through, you would want to use the refine edge tool.

(Example taken from this gif set)

To paint with the refine edge tool, click and hold the roto brush tool button until a menu pops up, and choose refine edge tool. Then simply paint over areas that need refining, for this gif it’s the area where the background is peaking through her hair. After that, you can again adjust the refine tool selection in the Effect Controls Panel.

4. Keyframes

The second key part of the gif is animating the bar progression.

1. Create a bar of your desire length by going to Layer → New → Shape Layer, or right click anywhere and choose New → Shape Layer.

2. Click and hold the Rectangle Tool, choose Rounded Rectangle Tool. Then draw the bar where you wanted on the gif in the shape layer. And add a drop shadow to the bar (opacity: 50%, direction: 235.0°, distance: 4.0, softness 5.0).

3. To adjust the roundness of the shape. Go to the timeline panel, open up the options for your shape layer. Then go to Contents → Rectangle → Roundness, adjust the value to your liking.

4. Before animating the bar, you need to move the anchor point to the beginning of the bar. Click on the Pan Behind (Anchor Point) Tool, or hit Y on your keyboard. Then move the anchor point to the beginning of the bar.

5. To animate the bar, go to timeline and choose the frame where you want the bar to reach 100% length. Then open up the shape layer options, go to Transform → Scale, click the chain button to unlink the width (x) & height (y) transformation. Then click the stopwatch button on the left to create a keyframe.

This is how it should look afterwards.

6. Then go to the first frame, and change the width (x) to 0% to create another keyframe.

Now you should have something like this. The bar progress from 0% to 100% at a constant rate.

7. To get the animation to ease in and ease out, meaning it starts and ends slower and speed up in the middle. Highlight your 2 keyframes. Right click the keyframe and choose Keyframe Assistant → Ease Ease.

To get more control over the rate of progression. You can click the graph icon and adjust the curve handles.

This is now what you should have. Repeat for all of the listed items and you’ll have the end result.

5. Exporting video

To export, go to File → Export → Add to Render Queue. Then Click Render to export.

Sometimes there might be transparent areas in your video that you’d want to keep. To do that, click on Lossless to open up the Output Module Settings and changed the Channels from RGB to RGB + Alpha.

After exporting the AE file as video, I’ll import it back to PS, convert to frames, set frame delay, then export as gif.

This is the end of the tutorial. Hope this helps.