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$(document).ready(function() {
	$('#play-video').on('click', function(ev) {
		this.style.display = 'none';
		thevid = document.getElementById('video');
		thevid.style.display = 'block';
		$("#video")[0].src += "?autoplay=1";
		ev.preventDefault();

	});
});

<div class="video-container">
                      <img src="img/yt-video.jpg"/ id="play-video" class="img-responsive">
                      <iframe style="display:none" id="video" src="https://www.youtube.com/embed/SzmioR4Dj8E" frameborder="0" allowfullscreen></iframe>                
</div>