On this thread Jeff and I were trying to figure out a similar thing for the movie on Page 28 (the Earth movie). But I think you can use the same technique with the Paul Nurse movie.
Try Jeff's method first (you need to be able to edit in a masked image to your movie for this approach). The reason I suggest that is that with my method there is a definite delay when the movie "shrinks back" when you pinch it closed.
Thanks, SPuD. I'll play around with this a bit. I appreciate your help. :-)