Play videos directly on website using html code : I have written some html code to play video directly from youtube. My code is like this:

      <div class="col-md-6">
          <h2 class="line-bottom mt-0">University <span class="text-theme-colored2">Video</span></h2>
          <div class="row">
            <div class="col-md-12">
              <div class="box-hover-effect play-button">
                <div class="effect-wrapper">
                  <div class="thumb">
                    <img class="img-fullwidth" src="images/about/5.jpg" alt="project">
                  </div>
                  <div class="overlay-shade bg-theme-colored"></div>
                  <div class="video-button"></div>
                  <a class="hover-link" data-lightbox-gallery="youtube-video" href="https://www.youtube.com/watch?v=om4qTKMuPPs" title="Youtube Video">Youtube Video</a>
                </div>
              </div>             
            </div>
          </div>
        </div>

But, after clicking the play button, nothing is happening. Is there anything wrong in my code? How will I play the video?