I need an app or software that can do a face overlay

711eman711

I need an app or some software that will be able to do a face overlay, like when u photoshop a head so its just the head then put it over someones head in a video so it looks like its theirs, ya, all i can find is stuff for windows that will do that, so if anyone knows software that would do that please let me kno, thx

marvin

After Effects or Shake.