How to hide all that not in camera field of view How to show only that part of the scene that can be seen from the camera and hide everything that does not fall into its field of vision.

I accidentally found this hotkey before, but I can not find it now.
Finally I found a solution. The hotkey is: Alt+B (Clipping Border)


Switch to camera view
Press Alt+B
Select camera view area by cross selection tool
Switch to 3d window
Voila!