Support react-native-video on RNW vNext

[stecrain]

@harinikmsft Here's the issue

I want to start experimenting with video support in a React Native Windows project.
To stream play all of the content I'm interested in the video player would need to support mpeg dash and Microsoft smooth streaming.

There is an existing project that adds support for video to the C# React Native Windows implementation. I'm not sure if it makes more sense to update the existing react-native-video to work with RNWCPP or if it should live in this repo. Just wanted to point out that it exists :)

[rozele]

I would recommend that we fork react-native-video and use this work item as an opportunity to flesh out the native component extensions model.

[ahimberg]

Latest rnwcpp-preview has initial support for adding custom view managers, more work to do things nicely but its possible now.

[stecrain]

Excellent!
So with the latest changes I should be able to just add a custom ViewManager for Video and map it to MediaPlayerElement? (for example)

[ahimberg]

I believe that should be possible but I haven't actually confirmed I can use the custom viewmanager headers/types from outside the repo, we'll be trying that soon in our codebase and fixing up if there are any minor issues. Look at CustomViewManager and replace winrt::checkbox with the xaml control you are wrapping