Question / Help Help Screen Capture by 1/4

OTC

New Member
Help, I am trying to one of capture 4 cameras (one at a time) into one full sized screen output. I want to be able to pick one of 4 cameras and have 4 equal areas or "Sources" to choose from. Can someone please tell me how to, or direct me to a video telling me how to screen capture 1/4 of my screen into a full screen so I can select a button and pick which one I want to display on my output please?
 
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