video.js

players = [];
function onYouTubeIframeAPIReady() {
  _.each($('.article__video-frame'), function(item, i) {
    var player = new YT.Player('player' + i, {
      height: '400',
      width: '700',
      videoId: $(item).attr('data-vid'),
      events: {
        'onStateChange': onPlayerStateChange
      }
    });
    players.push(player);
  });
}

function onPlayerStateChange(event) {
  console.log(event);
  if (event.data == YT.PlayerState.PLAYING) {
    stopVideo(event.target.a.id);
  }
}

function stopVideo(player_id) {
  _.each(players, function(player, i) {
    if (player_id !== "player" + i) {
      players[i].stopVideo();
    }
  });
}

function loadScript() {
  var tag = document.createElement('script');
  tag.src = "//www.youtube.com/iframe_api";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
}

loadScript();

$(document).ready(function() {
  setTimeout(function(){
    onYouTubeIframeAPIReady();
  }, 300);
});