Video.js is a HTML5-based video player with a built-in Flash fallback for older browsers. This means that videos can be played on nearly all devices and operating systems, provided the right codecs are used.
This module is a support module for Video.js. It doesn't contain Video.js itself, but integrates it with the File, Link and Video modules after you've installed it.
Video.js (HTML5 Video Player) connects the file field to the Video.js library.
This page is based on my experience with videojs-7.x-3.x-dev and video-js-4.10.2.