Need visual indication that video recording isn't capturing sound

When recording a video and the camera-app doesn't have permission to access the microphone, no audio will be recorded. This is expected of course, but it would be useful to have a visual indication that this is happening, perhaps somewhere on the camera HUD. Without this visual indication the users has no way of knowing that the video won't have any sound, until they try to play back the video, and then it's too late. I have a few important videos without sound for this reason :/.

Also, taking a step back, a more fundamental solution would be to follow Matthew's suggestion from bug 1554142: the camera-app shouldn't ask for a special microphone permission, "the ability to record video includes the ability to use the microphone".