Support for element type: 'video' | 'canvas' and control of that element.

[jewel998]

Describe the solution you'd like
If we could get control over the video or canvas element while the element is being shown, it could help us with several features like rendering AR, VR, Effects, Filters functionality.

Describe alternatives you've considered
It would provide us good support for development if MediaStream would be available, in that case, we can use several other features passing it through Web Tensorflow models to benefit better.