Face Tracking in Video with Photo Overlay


I am new to blender and also not sure if this topic has been discussed before but I am trying to create a video where I track actors faces from scenes in various movies and overlay with a photographs of other people, it doesn’t need to look ultra realistic as it is more for comedy purposes.

So I need to know how to:

  • Track a face in a video (scene from a movie)
  • Overlay an image to the tracked face

Any help will be much appreciated, I am trying to create a video for my wedding guests to watch on the day (prior to the ceremony).