Can I record app gameplay from my Iphone?

I want to get something for christmas that I can use so I can record myself playing an app directly off my phone that I can upload to youtube? I want something so I can record just the gameplay of me playing the impossible game on my Iphone 3s. Are there any recording devices out there that I can get to record,(preferably before Christmas) my gameplay. Any suggestions will be considered and are appreciated. Thanks.

This is not possible without Jailbreaking. The only hardware would be the iphone to yellow, red, white cable and then input that signal into some sort of pvr. However only movies/video is sent through this cable and not the screen data itself so sorry you cant record apps