I verified the location of viewports on the A-17B adaptor, and compared those positions to the stated plan in T1000746-v5, and found that the most likely viewport position (VP5) to use for the video camera, has a blank on it. See attached file.
Lisa Austin confirmed today that, at EY on the A-17B Adaptor, VP5 should be a video viewport, but is currently a blank, and VP10 should be a blank, but is currently a viewport.