参考： https://web.dev/articles/camera-pan-tilt-zoom

微信 iOS 版内置浏览器，可以支持 zoom， 但微信安卓版内置浏览器，不支持 zoom 。

const stream = await navigator.mediaDevices.getUserMedia({
  video: { zoom: true }
});

const [videoTrack] = stream.getVideoTracks();
const settings = videoTrack.getSettings();

if ("zoom" in settings) {
    console.log("Support zoom.");
} else {
    console.log("Not support zoom.");
}