So I've been trying to figure out if it's possible to add a video tap to a Bolex, and I recently came across this image showing a Bolex on a Steadicam with a LCD incorporated. I was wondering if anyone could give an explanation or idea as to how they managed to do this. My theory is, they took a small external camera and positioned it in the viewfinder, then outsourced it to the LCD so they could get a pretty accurate idea of exactly what they were filming. I'm not sure if they struggled with any latency problems, but if this was the case that would be pretty clever.
Here is the setup: