Help with popover Bootstrap

// 2. This code loads the IFrame Player API code asynchronously.
      var tag = document.createElement('script');
      tag.src = "http://www.youtube.com/iframe_api";
      var firstScriptTag = document.getElementsByTagName('script')[0];
      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

      // 3. This function creates an <iframe> (and YouTube player) after the API code downloads.
      var player;
      function onYouTubeIframeAPIReady() {
        player = new YT.Player('player', {
          height: '390',
          width: '640',
          videoId: 'ecccag3L-yw',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
      }

      // The API will call this function when the video player is ready.
      function onPlayerReady(event) { /* do nothing yet */ }

      // The API calls this function when the player's state changes.

      function onPlayerStateChange(event) {
        if (event.data == YT.PlayerState.ENDED) {
                // insert appropriate modal (or whatever) below 
            alert('teste');
                    
        }
      }

 <div id="player"></div>