The playsinline attribute ill start to be more and more supported. It's great to have mp4 streaming on background instead of using gif.
<video playsinline> elements will now be allowed to play inline, and will not automatically enter fullscreen mode when playback begins.
<video> elements without playsinline attributes will continue to require fullscreen mode for playback on iPhone.
When exiting fullscreen with a pinch gesture,
<video> elements without playsinline will continue to play inline.