Why do people tap the back of cameras during filming?
https://www.youtube.com/watch?v=bYWAHuFbLoc&t=58m49sAt 58 min 49s, the video above shows on-set footage of a film crew. (Link is setup to start playing from there.)For a few seconds, it shows people following the camera and repeatedly tapping the back of the camera.Why are they doing this? Is this still a thing with modern equipment?