Adding background video to components is pretty fun…
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What is recommended background video specs to show on iPhones?
Stick with MP4 (H.264), 720p or lower, no audio, ~2MB or smaller, 10–15s loop. Those are ideals, certainly not a hard and fast rule.
Do you have the following attribute set for iOS?
playsinline
webkit-playsinline
playsinline is added on the Video component, but it’s missing on the Container component. We’ll get that added ASAP 
This is what I added to get it working in the meantime in the main index.php file.
playsinline x-webkit-airplay=“allow” webkit-playsinline