How does this work? VR googles and R/C airplane, head movement also moves camera see details for more info:?

"Here's a remarkable video shot from the cockpit of a radio-controlled airplane. The camera's video is transmitted to the flyer on the ground below, who's wearing VR goggles. When he moves his head, the remote camera's pans and tilts correspond exactly to his movements. The result is a extraordinary feeling of actually being in the plane" via Gizmodo

Video on: gizmodo.com/remote-flying-with-vr-goggles-and-a-camera-202964

SO HOW DOES THIS WORK?