Replacement for Video Library on Mac (webcam feed)

[Ben Rubinstein]

I needed to do something with a webcam feed, and confidently set out to do 
this using revInitializeVideoGrabber/revPreviewVideo etc. After several times 
scratching my head wondering why it didn't work I finally read the note in the 
dictionary that says "Support for the "Video Grabber" library on Mac OS X 
ended in LiveCode 9.0."

But I can't seem to figure out what the replacement is?

What's the most straight forward way to display the feed from a webcam in LC 9 
and later, on macOS?

TIA,

Ben