freedom/layouts/shortcodes/video-player.html

<style>
   body{
    background-color: black;
   }
   header,footer{
    display:none;
   }
   #main{
        position: absolute;
        top:0;
        left: 0;
        width:100vw;
        height: 100vh;
        max-height: 100vh;
        max-width: initial;
    }
</style>
<video controls id="main" class="video-player">
        <source src="">
    </video>
    
    <script>
        //https://davidwalsh.name/query-string-javascript
    function getUrlParameter(name) {
        name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
        var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
        var results = regex.exec(location.search);
        return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
    };
    
    var source = document.createElement('source')
        source.src = ''+getUrlParameter('v');
        document.getElementById('main').appendChild(source);
    </script>