If you look at gaussian splatting and diffusion morphs/videos, this is merely in the space of "not broadly on hugging face yet" and not impossible, or even difficult depending on the gesture.

We're months away from fully posable and animatable 3d models of these AI images. It already exists in demos and on arxiv, it runs on consumer hardware but not in realtime, so a video upload would work but a live stream would require renting a cloud GPU ($$$).