Is it possible?
- https://www.youtube.com/watch?v=z3eLoCnUqFo
- https://www.youtube.com/watch?v=bm_zzgo9Ucw
- https://www.google.be/search?q=mocap+using+opencv&client=ubuntu&hs=66Y&channel=fs&source=lnms&tbm=vid&sa=X&ved=0ahUKEwiDooOO7u_VAhUPZFAKHcklD8QQ_AUICygC&biw=1855&bih=949
YES it is. Where to start? Look at the specific projects already trying something like this ...