// enforced callback from Youtube = must be top-level
function onYouTubeIframeAPIReady() {
    app.video.loadVideo('#myVideo');
}

app.video = (function() {
    function init() {
        // from https://developers.google.com/youtube/iframe_api_reference
        // not: will not work in IE7 (postmessage)

        // load API code
        var tag = document.createElement('script');
        tag.src = 'https://www.youtube.com/iframe_api';
        document.body.appendChild(tag);
    }

    function loadVideo(container) {
        var video = $(container);
        var myVideo = new YT.Player(video.attr('id'), { // id of container
            height: video.data('height'),
            width: video.data('width'),
            videoId: video.data('src'),
            events:{
                'onReady': onPlayerReady,
                'onStateChange': onPlayerStateChange
            }
        });
    }


    function onPlayerReady(event) {
        // pass
    }

    function onPlayerStateChange(event) {
        switch(event.data) {
        case 1:
            _gaq.push(['_trackEvent', 'My Video', 'Internal Link', 'Click to play ' + event.target.l.id]);
            break;
        case 2:
            _gaq.push(['_trackEvent', 'My Video', 'Internal Link', 'Click to pause ' + event.target.l.id]);
            break;
        case 0:
            _gaq.push(['_trackEvent', 'My Video', 'Internal Link', event.target.l.id + ' finished']);
            break;

        default:
            break;
        }
    }

    return {
        init: init,
        loadVideo: loadVideo
    };
})();

https://developers.google.com/youtube/iframeapireference