Displaying Video from a Webcam using Clojurescript and Reagent

As part of a book cataloging project, I want to be able to use a webcam on a desktop or laptop to scan ISBN (International Standard Book Number) numbers from the jackets of physical books. This isn’t quite as easy as scanning barcodes with a phone or tablet because of focus, magnification, and depth of field characteristics of desktop and laptop cameras. (Or so I’m told. I really don’t know much about it yet.