How to lock only one display?

Question

Windows

Hello! There is a computer with Windows 8 on which the administrator works. A second monitor is connected to it, on which an application with CCTV cameras is running. It is necessary that when the administrator leaves the computer, she can lock the computer, but at the same time the second monitor with cameras continues to work so that you can watch the cameras.

Answer 1

There are third-party utilities that block the keyboard and mouse (until the password is entered), but leave the monitor image. For example, from children - kidkeylock (the degree of its protection from hacking is unknown to me + it is necessary to turn off the display of the password on the hint).

Answer 2

Let him just turn off the main monitor with a button, and upon returning he hits his hands if he was turned on without it =)))