There's 2 options :

1. Jailbreak your iPad 2 (I don't think there is one yet). Then you get an app that records display (I think its called Display Recorder).

2. Manually take a video of you playing on your iPad, through a phone, camera, etc.

I actually want to try and link my iPad to my TV through the HDMI cable thing, then I could probably see PL on my TV, so I take a video from there.