NFL: The All-22 Football Footage the League Won't Show You - WSJ.com: Every play during an NFL game is filmed from multiple angles in high definition. There are cameras hovering over the field, cameras lashed to the goalposts and cameras pointed at the coaches, who have to cover their mouths to call plays.
But for all the footage available, and despite the $4 billion or so the NFL makes every year by selling its broadcast rights, there's some footage the league keeps hidden.