On-demand vimeo embedded videos with oEmbed API, no jQuery, just javascript. Videos are not loaded on page load for performance reasons, use placeholder images, then on click, fire off the javascript.

app.js

/* --- Just your general app file --*/
(function(){
    var triggers = document.querySelectorAll('[data-js="embedTrigger"]');

    [].forEach.call( triggers, function(element) {
        element.addEventListener('click', function() {
            Embed.init({
                elementId: this.id,
                videoId : this.getAttribute('data-video'),
                autoplay : true,
                vidWidth: 640,
                vidHeight: 400
            });
        }, false);
    });

}());

Embed.js

var Embed = {
    
    config : {
        elementId : 'embed',
        trigger: document.querySelectorAll('[data-js="embedTrigger"]'),
        videoId : 7100569,
        autoplay : true,
        vidWidth: 640,
        vidHeight: 400
    },

    trigger : function() {
        // Move trigger here if wanted
    },

    put : function(video) {
        var el = document.getElementById(this.config.elementId);

        el.innerHTML = unescape(video.html);
    },

    init : function(options) {
        if( typeof options === "object" ) {
            this.config = options;
        }
        
        var js = document.createElement('script'),
            callback = 'Embed.put',
            endpoint = 'http://www.vimeo.com/api/oembed.json',
            videoUrl = encodeURIComponent("http://www.vimeo.com/" + this.config.videoId),
            w = this.config.vidWidth,
            h = this.config.vidHeight,
            autoplay = this.config.autoplay,
            url = endpoint 
                + '?url=' + videoUrl 
                + '&width=' + w 
                + '&autoplay=' + autoplay 
                + '&callback=' + callback;

            js.setAttribute('type', 'text/javascript');
            js.setAttribute('src', url);
            js.setAttribute('async', true);
            document.getElementsByTagName('head').item(0).appendChild(js);
    }
};

index.html

<!-- usage in HTML -->

<div id="testVideo2" data-video="58834399" data-js="embedTrigger">
    <img src="http://placehold.it/640x400"> <!-- Uses placeholder image -->
</div>