Boom operator assist

If the camera is windowed down to less than full resolution, then there are unused pixels around the frame. What I want is a feed of the pixels between the top of the frame and the "top" (which is actually the physical bottom) of the sensor. I want to feed this to a separate monitor for the mike boom operator. It can be low resolution and/or low frame rate. It can be multiplexed into the main output, if we have some way to extract it, or maybe the camera will have multiple network ports?
 
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