Upload and Display MP4 Video
Go to : Store Admin –> Settings –> Files –> Upload Files –>
Upload MP4 video and copy video url. Video size can not be more than 20MB.
Go to : Theme Customize –> Sections –> Add section –> Custom Block –> Click on Add Content –> Custom HTML
Put below html code and paste video url in src.
<video width="100%" autoplay loop muted playsinline > <source src="paste video url here" codecs="avc1.4d002a, mp4a.40.2" type="video/mp4"> Your browser does not support the video tag. </source></video>
Do not forget to click on Save button.