[S3xySmurf]

depends which video editor you're using
i used videopad to do this same thing (with just one face tho) 14 seconds into this garbage https://youtu.be/jIAdA8-5CF0
i cropped a video to only this dude's face (so that everything around it became transparent) and moved the cropped video so that his face covers CIA's, it's not perfect but whatever

if you already solved your problem then i just wasted 30 minutes

Unfortunately I did solve my problem but thanks for you effort and time