JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<section id="top" class="clearfix">
  <div class="wrapper">
    <div class="ml-title" style="margin-bottom: 2em">
      <span class="pull-left top">Watch</span>
      <ul role="tablist" class="nav nav-tabs video-nav-tabs">
        <li class="active"><a data-toggle="tab" role="tab" href="#video_1" aria-expanded="false">Video 1</a></li>
        <li>
          <li><a data-toggle="tab" role="tab" href="#video_2" aria-expanded="false">Video 2</a></li>
          <li><a data-toggle="tab" role="tab" href="#video_3" aria-expanded="false">Video 3</a></li>
      </ul>
    </div>
    <div class="tab-content">
      <div id="video_1" class="rows tab-pane in fade active">
        <div class="post">
          <iframe width="560" height="315" src="https://www.youtube.com/embed/kJQP7kiw5Fk" frameborder="0" allowfullscreen></iframe>
        </div>
      </div>
      <div id="video_2" class="rows tab-pane in fade">
        <div class="post">
          <<iframe width="560" height="315" src="https://www.youtube.com/embed/JGwWNGJdvx8" frameborder="0" allowfullscreen></iframe>
        </div>
      </div>
      <div id="video_3" class="rows tab-pane in fade">
        <div class="post">
          <iframe width="560" height="315" src="https://www.youtube.com/embed/papuvlVeZg8" frameborder="0" allowfullscreen></iframe>
        </div>
      </div>
    </div>
  </div>
</section>

JavaScript

$('ul > li').click(function() {
	  	var $activeVideoIframe = $('.tab-content').find('.active').find('iframe')
		var playingVideoSrc = $activeVideoIframe.attr('src');
		$activeVideoIframe.attr('src', '');
		$activeVideoIframe.attr('src', playingVideoSrc);
	});