<video> doesn't render MediaStream from getUserMedia

Previewing camera input in a video element using getUserMedia works perfectly fine in Chrome, but breaks as soon as we open the same view within a cordova app.

Added an example using Mozilla gUM polyfill here: https://s3-eu-west-1.amazonaws.com/rafal-temp/index.html

(note that both new and deprecated gUM APIs don't work).

This results in an empty, black <video> element. No errors are fired.

Initially I thought, that this issue was related to AndroidManifest.xml permissions and CSP, but fixing them makes no difference.