Re: [mediacapture-image] Include malicious sites and surveillance cameras in the PTZ explainer (#222)

Having access to the stream does not necessarily mean there is a `<video>` element associated to it, and visible as well.

```js
const videoStream = await navigator.mediaDevices.getUserMedia({
  video: { pan: true, tilt: true, zoom: true }
});

// Code below is optional
const video = document.querySelector("video");
video.srcObject = videoStream;
```

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