how to grab youtube video link from 9gag.tv

I am using [Simple HTML DOM Parser]: http://ift.tt/z3pyhV

<?php
include('simple_html_dom.php');

// get DOM from URL or file
$html = file_get_html('http://www.9gag.tv/');

// find all links
foreach($html->find('a') as $e)
echo $e->src . '<br>';

?>

But their is no video on their homepage, i don't see any specific page (for e.g 9gag.com/hot) wheir all videos are posted. Please help me with this. How can i grab video links from 9gag.tv and which tag should i use to find video links. Thanks.