Customizable Video Cam Recorder app for iPhone and iPad

Tap on the screen to start video recording.
If you pick top part of the screen, front camera will be used, if you select bottom of the screen you start recording by rear camera.

If you want to use custom backgrounds for camera preview just shake your phone to see settings menu.
Then set your favourite custom background from your photo library. You can pick screen from your favourite other app. Just do the screenshot (home button + power button) inside other app then go to app settings menu, select screenshot from your photo library and set as custom background.