Add support for videoConstraints #123
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- Can be passed while starting the scan - Added two new experimental APIs in `Html5Qrcode` class - getRunningTrackCapabilities() allows getting capabilities of a running stream - applyVideoConstraints() allows setting constraints while the stream is running, doesn't support aspectRatio at the moment.
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Oct 11, 2020
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Html5QrcodeclassDemo: https://blog.minhazav.dev/research/html5qrcode-video-constraints