There is one IOS video screen capture program that I have found: Display Rec. It works on my Touch/iPhone, not sure about the iPad.
It requires a lot of editing afterwards to cut out the bits and pieces you don't want and to make your app seem like it is really smooth and easy to use.
I tried using iMovie on the Touch/iPhone but that is not a good idea. Dragging it over to your desktop and having a good at slicing, etc. is a better idea.
You can also 'fake' a movie by using a screen capture since there is a lot of dead air between clicks.
Don't forget, you can put a lot of screen shots into containers and do a timed presentation in Filemaker. Also use PowerPoint and capture that as a movie.