See the video below which Fox News taped but did not air. (How do we know this? Notice that the man interviewed gestures to his right then the camera taking the video you are actually watching pans to show the Fox News camera).
My favorite part comes when the Fox talking head ratchets up the smug and smarmy by mentioning that this interview will (but not in the reality the rest of us occupy) be aired and that Fox is "giving" him the same coverage as they did the tea party. Hint to Fox: if you do not actually air the interview, you're not actually giving anyone anything even pretending to be fair or balanced.
Good idea that - having your own camera taping at the same time.