Looking at the Media Capture API support announced in the Safari Technology Preview...
It's possible using the QuickTime client to record video from an iOs device plugged in to my Mac. The device shows up in Qt as a virtual camera.
And, it shows up in the same way in the AV Foundation.
Will this virtual camera be offered as a video source to the Media Capture API? Will it be possible to capture / compress this device video with Safari?