mp4 as background not playing on iphone

Plays perfectly on just about everything but the latest ios.

I have the background set to zero opacity and I have the mp4 z-index -1

All I need it to do is loop on the iphone. Works perfect on desktop and andriod phones.

https://dev.terrapincarestation.com/html5test/300x250-test-2/test-2-300x250.html