How to translate iPhone camera image as a background?

Hi everyone!
Actually I am a very beginner at Unity3d and also in programming. But I very interested in developing my own game.
This game will be for mobile devices. Now I am trying to make it for iOs.
I need a dynamic image from mobile camera as a background. (Sorry, I am not good in English so let me explain a little bit for being sure that you understand me. I need non static “photo” image. I need a dynamic image from camera translated to the screen just like when you open a camera and aiming for photo. But without any photos. Just image from camera.)
How to make my app able to request that image?
And also can you suggest any tutorials about how to make cobtrols with gyro?

Just use the built-in WebCamTexture and Input.gyro classes.