suggest a parameter in getUserMedia

During development, we do not need keyboard or mouse for input, just video camera for input.So it is not possible to use keyboard/mouse to select the options, and  our use case can have other way for user authentication.

And can we have a mode, that getUserMedia only generate mediastream without prompt to user for camera usage confirmation?

Can we have a parameter "popup:off" in getUserMedia ({video:true,audio:true,popup:off},gotStream,noStream)
So browser will not prompt to user select device, and silently activate the camera and audio deivce.

And the browser may have a configuration that popup:off is enabled in "privacy region"

Yang
Huawei