Needs better detection for autoPlay support.

[jfrux]

May I suggest this logic and the addition of a $.fn.supportsAutoPlay function?

This is an example of detecting autoPlay, not sure how foolproof it is?
fairly psuedo-code not tested... sorry~

               $.fn.videoBG.supportsAutoPlay = function() {
                   var AUTOPLAY = false;
                try 
                {
                    var video = new Video();
                    video.autoplay = true;
                    video.volume = 0;

                    // this will only be triggered if autoplay works
                    $(video).on('play', function() {
                        AUTOPLAY = true;
                    });
                } 
                catch(e) 
                {
                    return false
                }

                return AUTOPLAY
            });
}

[jfrux]

In fact, here is a jsfiddle link that if you load it in certain browsers and in mobile it will detect it...
http://jsfiddle.net/QqeX5/1/
http://fiddle.jshell.net/QqeX5/1/show

[jfrux]

Meh... I see where there could be issues...