Set ImagePickerController object to AVCaptureDeviceInput

I am using ImagePickerController for Video Capturing. I need to save the capturing video as image also . So I choose AVCaptureSession for capturing Images. I con't able run开发者_开发问答 the AVCaptureSession as well as ImagePickerController. So I need to give the ImagePickerController as Input to the AVCaptureSession. But I don't know how to do that. Please Help me.. and suggest me for the right way.

Thanks in Advance,