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HTML

              
                <div id="visual_header" class="background">
  <div class="background-wrap">
    <div class="background-movie">
      <div id="background-movie-player"></div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                .background {
  background: url(https://www.non-standardworld.co.jp/wp-content/themes/nswinc/img/visual_header.jpg) no-repeat center center;
  background-size: cover;
  position: relative;
  z-index: -2;
  width: calc(100vh * 1.78);
  height: 100vh;
  margin: 0 auto;
            
  .background-wrap {
    position: relative;
    top: 0;
    left: 0;
    z-index: -1;
    min-width: 100%;
    min-height: 100%;
    overflow: hidden;
    .background-movie {
      position: relative;
      display: flex;
      justify-content: center;
    }
    #background-movie-player {
      width: calc(100vh * 1.78);
      height: 100vh;
      flex: none;
    }
  }
}
              
            
!

JS

              
                // YouTube IFrame Player API の読み込み
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

// YouTubeの埋め込み
var ytPlayer;
function onYouTubeIframeAPIReady() {
  ytPlayer = new YT.Player(
    'background-movie-player', // 埋め込む場所の指定
    {
      playerVars: {
        playsinline: 1,
        autoplay: 1, // 自動再生
        loop: 1, // ループ有効
        listType: 'playlist', //リスト再生
        list: 'PLYpUhFEzQAcTwTxvxx04al09DDKjnDuZT', // 再生する動画リスト
        controls: 0, // コントロールバー非表示
        enablejsapi: 1, //JavaScript API 有効
        iv_load_policy: 3, //動画アノテーションを表示しない
        disablekb:1, //キーボード操作OFF
        showinfo:0, //動画の再生が始まる前に動画のタイトルなどの情報を表示しない
        rel:0, //再生終了時に関連動画を表示しない
      },
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange,
        'onError': onPlayerError
      }
    }
  );
}

// プレーヤーの準備ができたとき
function onPlayerReady(event) {
  // 動画をミュートにする
  const player = event.target;
  player.mute();
  player.playVideo();
}

// onStateChangeのコールバック関数
function onPlayerStateChange(event) {
  var status = event.data;
  var playerWrap = $('#header .background-wrap');
  var names = {
    '-1' : '未開始',
    '0' : '終了',
    '1' : '再生中',
    '2' : '停止',
    '3' : 'バッファリング中',
    '5' : '頭出し済み'
  };
  //バッファリングの完了後、動画背景を表示させる
  if (status == 1) {
    $(playerWrap).css('opacity','1');
  } else {
    $(playerWrap).css('opacity','0');
  }
}

// errorの発生時
function onPlayerError(event) {
  var errorstatus = event.data;
  var playerWrap = $('#header .background-wrap');
  //何らかのエラーステータスが渡された場合、youtubeプレイヤーを削除する
  if (errorstatus !== '') {
    $(playerWrap).remove();
  }
}
              
            
!
999px

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