With hero3 it is not a problem, see the very first sentence.
It does not stream over usb. There's no app to simulate webcam on the host operating system. Hero3 outputs hdmi, you use some hdmi-to-usb dongle, which are plain old USB UVC class devices and every operating system out there with usb support knows how to handle them. So if a logitech or whatever webcam works, this one will work too.
However, I see that hero9 has no hdmi out. That's the bummer.
It does not stream over usb. There's no app to simulate webcam on the host operating system. Hero3 outputs hdmi, you use some hdmi-to-usb dongle, which are plain old USB UVC class devices and every operating system out there with usb support knows how to handle them. So if a logitech or whatever webcam works, this one will work too.
However, I see that hero9 has no hdmi out. That's the bummer.