<div class="video-wrapper">
   <video id="myVideo" width="320" height="240" controls>
      <source src="path/to/your/video.mp4" type="video/mp4">
      Your browser does not support the video tag.
  </video>
</div>

<script type="text/javascript" data-author="Tony Partner">
 
  $(document).on('ready pjax:scriptcomplete',function(){
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
     
    // Hide all other questions
    $('.question-container').not(thisQuestion).hide();
 
    // Listener on the video
    $('#myVideo').on('pause', function(e) {
      $('.question-container').not(thisQuestion).fadeIn(500);
    });
  });
</script>