Re: [mediacapture-image] Document OverConstrainedError for PTZ in explainer (#229)

Supporting this pattern adds some complexity to the specification and to implementations.
If it is a bad pattern, why adding this complexity?

There is also the edge case of getUserMedia failing to applyConstraints while user granted device: the camera moved even though the web page never received a MediaStreamTrack. This seems slightly annoying.

Also, the following example would most probably succeed, which somehow shows how strange this API is:
```js
const [track] = (await navigator.mediaDevices.getUserMedia({video: {tilt: true}})).getVideoTracks();
await track.applyConstraints({video: {pan: 100}});
```

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Received on Thursday, 27 August 2020 08:29:30 UTC