MediaCapture Component for DirectShow Cameras

[sandrist]

The current MediaCapture component only supports Media Foundation cameras (virtual or physical). A new \psi component would need to be developed for supporting DirectShow cameras as inputs, e.g., the OBS virtual camera.

This issue represents a good community contribution opportunity, and is labeled 'help-wanted'. If you decide you would like to develop this component and contribute it to the codebase, we would be happy to consider/review a pull request. If you have further questions, please post them below. To avoid duplication of work, if you start working on this with the goal of creating a pull request, please mention this by replying to this issue.