Record game videos for publish

Hi,
I want to publish some videos of my games on Youtube.
But I don’t know how to record them, because it uses the accelerometer and I don’t want to use a my digital camera to make that, since I think the result video will not become professional.
Anyone have suggestions?

I remember that there’s a video teaching how to record video for mobile games, the author used a bubble box to embed both mobile phone and digital camera.
You can find this video on youtube.

I look on youtube,
this video is the most helpfull that I could find

if you have know another video, please share it, thanks