[lguyocsu] Faking out a camera

Consider placing a screen depicting a scene in front of a camera, say security camera, so that it records the screen scene instead of the real scene behind the screen.

The problem is, the camera's lens has been set to focus on the real scene further away from the screen, so recording a scene depicted on the screen will be out of focus.

This could be mitigated by placing another lens in between the screen and camera.  Design this lens.  This might be easy.