VideoPlayer.cs

public class VideoPlayer : MediaElement
{
    public static readonly BindableProperty CommandProperty =
          BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(VideoPlayer), defaultBindingMode: BindingMode.OneWayToSource);

    public ICommand Command
    {
        get => (ICommand) GetValue(CommandProperty);
        set => SetValue(CommandProperty, value);
    }

    public VideoPlayer()
    {
        ShowsPlaybackControls = false;

        Command = new Command<VideoTrigger>(ExecuteTrigger); 
    }

    private void ExecuteTrigger(VideoTrigger trigger)
    {
        switch (trigger)
        {
            case VideoTrigger.Play:
                Play();
                break;
            case VideoTrigger.Pause:
                Pause();
                break;
            case VideoTrigger.Stop:
                Stop();
                break;
        }
    }
}