Hi Walton,

Go to this page: \storm-jellythemes\homepage-video.php and follow the document in here: https://github.com/pupunzi/jquery.mb.YTPlayer/wiki.

You can focus quality setting: 

• quality: ‘default’ or “small”, “medium”, “large”, “hd720”, “hd1080”, “highres”.

Then insert it in this code:

<section id="home-slider" class="player section" data-property="{videoURL:'<?php echo esc_js($video); ?>',containment:'self',autoPlay:true, mute:true, startAt:0,opacity:1,ratio:'4/3', addRaster:true}" style="background:url('<?php echo esc_url($image['full_url']); ?>') center center !important;">

It will look like, I had add the hd720 in the code below:

<section id="home-slider" class="player section" data-property="{videoURL:'<?php echo esc_js($video); ?>',containment:'self',autoPlay:true, mute:true, startAt:0,opacity:1,ratio:'4/3', addRaster:true, quality: 'hd720'}" style="background:url('<?php echo esc_url($image['full_url']); ?>') center center !important;">