找到youtube iframe并将其替换为自定义代码(Find youtube iframe and replace it with custom code)

 我有一个wp网站，在很多帖子中我使用youtube视频嵌入了clasic iframe。 可以在帖子中找到iframe div并用自定义的youtube代码替换它吗？ 我想使用下面的代码来控制youtube视频。 它何时启动，何时完成。 
 
 我在帖子中的代码是： 
 
<iframe width="824" height="464" src="//www.youtube.com/embed/eEqIBzxHjiA?rel=0" frameborder="0" allowfullscreen></iframe>
 
 我想用以下代替： 
 
<script>

    // create youtube player
    var player;
    function onYouTubePlayerAPIReady() {
        player = new YT.Player('player', {
          height: '390',
          width: '640',
          videoId: 'eEqIBzxHjiA',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
    }

    // autoplay video
    function onPlayerReady(event) {
        event.target.playVideo();
    }

    // when video ends
    function onPlayerStateChange(event) {        
        if(event.data === 0) {            
          alert ('FInished');

        }
    }

</script>
 
 感谢你们... 

I have a wp site that in a lot of posts i am using youtube videos embeded with the clasic iframe. Is possible to find the iframe div inside post and replace it with a custom youtube code? I want to use the code bellow to control youtube video. When it starts, when it is finished.
 
The code that i have in my posts is:
 
<iframe width="824" height="464" src="//www.youtube.com/embed/eEqIBzxHjiA?rel=0" frameborder="0" allowfullscreen></iframe>
 
And i want to replace it with:
 
<script>

    // create youtube player
    var player;
    function onYouTubePlayerAPIReady() {
        player = new YT.Player('player', {
          height: '390',
          width: '640',
          videoId: 'eEqIBzxHjiA',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
    }

    // autoplay video
    function onPlayerReady(event) {
        event.target.playVideo();
    }

    // when video ends
    function onPlayerStateChange(event) {        
        if(event.data === 0) {            
          alert ('FInished');

        }
    }

</script>
 
Thank you guys...