the autoplay and loop are enabled in the plugin. You can check it in other browser like Firefox. But, as you can check in the article there are problems with some browser versions that not allow the autoplay.
<div id="fullscreen-wrap"><iframe id="player1" src="https://player.vimeo.com/video/' + i.videoId + '?autoplay=1&loop=1&api=1&player_id=player1" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe></div>
The variable i.videoId is the video ID set up in the admin panel.