Allow hijacking of getUserMedia() without videoIds

[zz85]

for example, some sites may call

getUserMedia({video:
  facingMode: "user"
  frameRate: 15
  height: 360
  width: 640
}

without videoId. If window.videoHijack is set to true, allow virtual-webcam to attempt hostile takeover

[spite]

I don't know how I feel about polluting the Window object. I also think that the original idea is to provide an extra Input source, nor to hijack actual sources. But i do like that the virtual webcam could "impersonate" a specific type of VideoInput. May be it's better suited for a different use case/extension?

[zz85]

Ah what you said make sense, that the virtual webcam is meant to be an additional input device. I agree that window object override is rather hackish. If you like to accept a toggle from the add-on, perhaps I could get it to pass from it as an option to the function. Another thing I realized, once the virtual webcam is turned on, the webcam lights stay on for the life time duration of the page