simple warp of a 2D movie

I have a feeling a big "duh" head smack is in my near future, but I'm not having much luck at the moment. I want to be able to warp a movie image in the center to give the feeling that you are passing thru an imaginary boundary in some way. As my partner said, "something like this?":

http://www.youtube.com/watch?feature=player_detailpage&v=H85hdn9a6KM#t=16s

*sigh* ... yes, something like that. Movie mapped to a big rubber sheet that I can lightly push and pull from the center to warp...just a little bit.

Any pointers on objects I should look at. All my processing is already in gl-land, so maybe a simple way to deform a video plane or ??

Thanks for any pointers.

David

P.S. OH! And any pointers on creating a little moire effect, too?

P.P.S. and an object to mow the lawn, too? that would be lovely.