How could I rewrite this php code to load my youtube video in an HTML container rather than a flash container like now?

I have a working PHP code that loads a youtube video inside an iframe which contains a flash player unfortunately.
This is not a desirable situation as I don't want to use flash.

How could I change this code to load the video but inside an HTML5 container that works across all devices?

thanks

<div id="vendor_video" class="cmsms_post_cont col-lg-6 col-sm-6 col-xs-12">

    <h1>Video</h1>
    
    <?php $parsed = parse_url($gallery_link); //echo "<pre>"; print_r($parsed['host']); exit; ?>
    
    <?php if($parsed['host'] == 'www.youtube.com') { ?>
    <?php  $gallery_link = substr($gallery_link, -11); ?>
    <?php $link =  "https://www.youtube.com/v/"."$gallery_link"; ?>			
        <div class="cmsms_video_wrap">				
            <iframe width="522" height="284" src="<?php echo $link; ?>"></iframe>
            <!--<iframe  width="522" height="284" src="http://www.youtube.com/embed/XGSy3_Czz8k?autoplay=0"></iframe>	-->				
        </div>
    <?php } else { ?>
            <div class="cmsms_video_wrap">				
                <iframe width="522" height="284" src="<?php echo $gallery_link; ?>"></iframe>						
            </div>
    <?php }  ?>
</div>

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