在我的电影播放器应用中使用加速度计

I had an app which plays videos from a web server but it just plays in landscape orientation. I want my app to use the accelerometer to play my videos both in landscape and in portrait orientation. I want my video playback feature to look like the youtube app in the iPhone. Can anyone please help me how to do this? thanksI had an app which plays videos from a web serv