Tracking how long an embedded video was watched

Hello-

I am trying to edit some video tracking mechanisms into landing page templates using munchkin. I was able to implement the below code without issue and am able to track video starts and finishes. However, I want to be able to parse out how much of the video they watched into percentages ( like 25%, 50%, 75%). I have tried implementing code shown here: nation.marketo.com/groups/dallas-user-group/blog/2016/08/25/track-youtube-videos-in-marketo  but the video wont embed on the page whenever i try.

Is there a way to edit my current code ( below) to capture the percentages?

<div id="player"></div>  
    <script>  
    var tag = document.createElement('script');  
    tag.src = "https://www.youtube.com/iframe_api";  
    document.getElementsByTagName('head')[0].appendChild(tag);  
      
    //Change 'iiqxcjxJ5Us' to video needed  
    var player, videoId = '{{my.Links_YoutubeID}}';  
    function onYouTubeIframeAPIReady() {  
    player = new YT.Player('player', {  
    height: '390',  
    width: '640',  
    videoId: videoId,  
    events: {  
    'onStateChange': onPlayerStateChange  
    }  
    });  
    }  
      
    function onPlayerStateChange(event) {  
    switch( event.data ) {  
    //Send video started event to Marketo  
    case YT.PlayerState.PLAYING: Munchkin.munchkinFunction('visitWebPage', {  
    url: '/video/'+videoId  
    , params: 'video=started'  
    }  
    );  
    break;  
    //Send video finished event to Marketo  
    case YT.PlayerState.ENDED: Munchkin.munchkinFunction('visitWebPage', {  
    url: '/video/'+videoId  
    , params: 'video=finished'  
    }  
    );  
    break;  
    }  
      
    }  
    </script>   
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