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<div class="embed-responsive embed-responsive-16by9">
   <iframe src="https://www.youtube.com/embed/bxhXpjWl0Dg" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>

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<div class="embed-responsive embed-responsive-16by9">
    <iframe frameborder="0" src="//player.vimeo.com/video/67957799"></iframe>
</div>

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<div class="row">
   <div class="col-md-6">
      <h4>4:3 aspect ratio</h4>
         <div class="embed-responsive embed-responsive-4by3 mb-none">
            <iframe frameborder="0" src="http://www.youtube.com/embed/gQaXbSPQoDQ?showinfo=0&amp;wmode=opaque"></iframe>
         </div>
   </div>
   <div class="col-md-6">
      <h4>Without Borders</h4>
      <div class="embed-responsive-borders">
         <div class="embed-responsive embed-responsive-16by9">
            <iframe src="https://www.youtube.com/embed/QIfXQcXSwRU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
         </div>
      </div>
   </div>
</div>