To try a demo, add to your common.js code below

importScriptURI('https://rawgit.com/MediaWikiArmenia/ZoomProof/master/zoomproof.js');

and sample page, containing ZoomProof data - https://hy.wikisource.org/w/index.php?title=Էջ:Հայկական_Սովետական_Հանրագիտարան_(Soviet_Armenian_Encyclopedia)_5.djvu/124&action=edit

UPD: As of 2022, due to some changes in WMF inftrastructure to which system has not (yet) been adjusted, demo will work on books which were called and cached previously. Backend is not running and won't process new books.