This was just released today and doesn't seem to be getting much press, but its an amazing video fx app called Film Genie. Basically it adds animations to videos up to 720p! The rendering is pretty fast but best of all its FREE 
http://itunes.apple.com/us/app/film-genie/id452884581?mt=8
http://itunes.apple.com/us/app/film-genie/id452884581?mt=8