A still image feature would probably be a good first step for an implement. I would imagine it would be easy to code, and they could use it to test the waters for more. it could also help with the report abuse button, sending a picture of the offending behavior.
If it takes off for whatever reason they could probably build on the code to make motion capture.
The sharing of the vids raises issues of server space, or making a VERY specialized file sharing program. Though if it only addressed the AChat program and the vid was saved locally in the persons AChat folder… HUGE potential for hacking, but if it could be secured it might work.
Still, not a bad idea.