Intraframe compression where each frame is individually compressed is barely used any more outside of movies and other professional nonsteamed production because it barely compresses the resulting video. Most streaming and consumer video cameras use interframe compression where you get a full frame every few frames and the rest are moving pieces of that around. This video by Captain Disillusion [0] goes over it much better than I can and any time the video is edited it goes through that process again of creating I-frames P-frames and whatever new homunculus frames are invented to further compress video while maintaining quality.

If you just cut away to the original clip and didn't have any modifications like motion graphics over the top of it you could in theory pass through the original video with the same compression and signing without too much drama but any modifications over that or presenting it as picture in picture would be a big difference as now you need to have both the original frames with the added graphics on top.

[0] https://youtu.be/flBfxNTUIns?t=139