Looks like technology called "deep fake"...
You start with a still photograph of someone. Also feed it a video of someone else making a series of facial expressions and moves.
https://www.youtube.com/watch?v=mUfJOQKdtAk
This one of Georg is pretty well done...
Looks like a service can generate these for you:
https://www.myheritage.com/deep-nostalgia
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.