[WIP] video_player example app working on AGP 9

[jesswrd]

This is a barebones workaround for getting the example video_player to work on AGP 9.

I ran flutter pub deps to see a tree of the example project's Flutter dependencies. Can also always look at pubspec.

Related to flutter/flutter#181383

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[jmagman]

Maybe a simpler example than camera that doesn't have a transitive dependency package like video_player?

[jesswrd]

done.