I work as a photographer for weddings, anniversaries, etc. On orders we go for three - two photographers and a video operator. So here is one of the important requirements for us, photographers, not to fall into the frame.
You know, on the camera, a red light is lit when the recording is going, so my friend, that the second photographer, seeing this red light, blows me "Let’s go!!! The Eye of Sauron!"
This is a professional term.