Microsoft's Insider Program has some 'splainin' to do - the webcam issue introduced in the Anniversary Update was not noticed by anyone? A fix is forthcoming next month, by that seems (to me) to be a pretty obvious thing to overlook.
Since Microsoft loves to hump Skype at every turn, and using a USB webcam in Skype with HD video is now broken, that appears to be poor quality control, no? Kind of disheartening for the first major upgrade for the new OS.
In the Anniversary Update, Microsoft only allows USB webcams to use YUY2 encoding. Microsoft removed support for MJPEG and H264 streams, which many webcams–including the very popular Logitech C920 webcam–use.
This means that doing something as simple as enabling HD video in Skype will cause your webcam’s video to freeze.Meantime, How-To Geek has a registry fix that will help until the "official" fix.