Preview stalls on iOS #900
Description
Describe the bug
On iOS the prevew stalls.
The first frame shows then it pauses. You can resume the display by scrolling down slightly.
The issue was encountered at Glasgow and by @fabienlombard
Rerpoducible on iPad with both Chrome and Safari
Technical details
On the dashboard the preview is currently embedded in an iframe. iOS is very aggressive with iframe and pauses the webrtc stream in ours. @sonnyp couldn't find a workaround in HTML/JS/CSS or in iOS/Safari settings.