Digital Comparator
 

I am looking for some software that can take a live video input and put a DXF cad file over the image.

Looking to build a Digital Comparator.

Something like this:
OV2 Optical-Video Adaptor - The L.S. Starrett Company

I know how to do all the digital readout and etc but am unsure about if I can find any software that can overlay a cad file over a video feed.

Also looking for a high end camera that can be used for this. Something that can be scaled to 10x / 25x / 50x accurately.