Avalonia: Add a convenient way to put controls over the video
Follow up on !18 (comment 73534)
Problem to solve
- Add a convenient way to put controls over the video, much like the WPF way. Look into having shared code for this.
- Verify if TwoWay binding mode is really needed.
Intended users
Avalonia users.
/cc FYI @shawnallen85 @jeremyVignelles