One thing that may help is to keep it analog as much as possible. To that end, my old studio had success running cameras directly to the screens(no switcher or security DVR involved). The cameras came with 100' cables for power and video. I found converter boxes that took the BNC video in and output on VGA. I attached those boxes to the backs of 19" flat screens(older 4:3 format). The only issue I had was the picture might go from color to B&W, depending on the lighting(more expensive cameras might help there)
