Record a video to file with xamarin IOS

I'm learning Xamarin IOS programmation (C#) and actualy have a code that displays the camera image to the screen. My goal is to be able to record a video but I don't find how to use AVCaptureMovieFileOutput to do that, and I don't want to use the media plugin because it doesn't allow to customize the view. I just need the base to record the stream to a file from my code, or if you have a complete but simple code to do that it's good too.