HTML5 JS Capture

http://www.th7.cn/web/js/201405/36201.shtml
https://mgechev.github.io/jscapture/
http://appcropolis.com/blog/web-technology/using-html5-canvas-to-capture-frames-from-a-video/
https://html5-demos.appspot.com/static/getusermedia/screenshare.html