[PD] Face tracking

[Jean-Marie Adrien]

Hello list
for a specific application I would need an object that detects a human face facing the camera, 
not very close but not far either : 2 meters away from an ordinary webcam lens). 

I do not know exactly where the face will be in the frame, and I would need its "center" and "size" or so in real time.
Anything in GEM opencv ? Any tutorial/example patch around ?
Thanks a lot !
Jm