function.php

// YouTube ShortCode [youtube src="" title="" duration="" thumbnail="" description=""]
function youtube_shortcode( $atts ) {
   extract(shortcode_atts(array(
	    'src' => '',
    	'title' => '',
        'duration' => '',
        'thumbnail' => '',
        'description' => ''
   ), $atts));
    $video_tag = '<div itemprop="video" itemscope itemtype="http://schema.org/VideoObject">';
    if ($title != ''){
        $video_tag .= '<h2><span itemprop="name">' . $title . '</span></h2>';
    }
    if ($duration != ''){
        $video_tag .= '<meta itemprop="duration" content="' . $duration . '" />';
    }
    if ($thumbnail != ''){
        $video_tag .= '<meta itemprop="thumbnailUrl" content="' . $thumbnail . '" />';
    }
    $video_tag .= '<meta itemprop="embedURL" content="http://youtu.be/' . $src . '" />';
    $video_tag .= '<div class="video-container"><iframe src="//www.youtube.com/embed/' .$src. '?hd=1" frameborder="0" allowfullscreen></iframe></div>';
    if ($description != ''){
        $video_tag .= '<span itemprop="description">' . $description . '</span>';
    }
    $video_tag .= '</div><br />';
    return $video_tag;
}
add_shortcode('youtube', 'youtube_shortcode');