I think so too. But the camera signal has to go through the PC before it goes to the monitor, I think.
There are some monitors that simply accept a camera (they have RCA input jacks) but those are rather old and I don't think he has that sort of camera.
Maybe a CCTV does that, but to use it with Zoom it would still have to go through the PC to get the Zoom program to accept the camera and sound input, etc. to use it in a meeting. That's in the PC, not the monitor.