how to create a video for iPod touch app video ?

for ppt presentation i want to create video for ipod touch app.

is their any possibility to create video

1. from Xcode 开发者_开发百科using simulator
2. or directly from device
3. or any other possibility

thank you very much

Please see: Is there a way I can capture my iPhone screen as a video?

This post describes many ways to capture video. It looks like there isn't a completely intuitive way to record the video, but this post lists some of the options others have used for their applications.