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<html>
  <head>
    <meta charset="utf-8">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    </head>

    <body>

    <iframe width="560" height="315" src="https://www.youtube.com/embed/rI4kdGLaUiQ" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

    <script>
      var channelID = "UCCTVrRB5KpIiK6V2GGVsR1Q";
      $.getJSON('https://api.rss2json.com/v1/api.json?rss_url=https%3A%2F%2Fwww.youtube.com%2Ffeeds%2Fvideos.xml%3Fchannel_id%3D'+channelID, function(data) {
      var link = data.items[0].link;
      var id = link.substr(link.indexOf("=")+1);
      $("#youtube_video").attr("src","https://youtube.com/embed/"+id + "?controls=0&showinfo=0&rel=0");
      });
    </script>
  </body>
</html>