"TSA does not prohibit the public, passengers or press from photographing, videotaping or filming at security checkpoints, as long as the screening process is not interfered with or slowed down. We do ask you to not film or take pictures of the monitors. While the TSA does not prohibit photographs at screening locations, local laws, state statutes, or local ordinances might." is from the TSA website. So as long as the monitors aren't in your view and you're not waving the camera about they'd ideally not be able to stop you.