MainPageViewModel.cs

public class MainViewModel : INotifyPropertyChanged
{
    public MainViewModel()
    {
       _videoPlayerStateMachine.Configure(VideoState.Playing)
           .OnActivate(OnStateEntry)
           .OnEntry(OnStateEntry)
           .PermitReentryIf(VideoTrigger.Forward)
           .PermitReentryIf(VideoTrigger.Rewind)
           .Permit(VideoTrigger.Pause, VideoState.Paused)
           .Permit(VideoTrigger.Stop, VideoState.Stopped)
           .OnEntryFrom(rewindParamTrigger, (seconds) => {
               MainThread.BeginInvokeOnMainThread(() =>
               {
                   Position = Position.Subtract(TimeSpan.FromSeconds(seconds));
               });
           })
           .OnEntryFrom(forwardParamTrigger, (seconds) => {
               MainThread.BeginInvokeOnMainThread(() =>
               {
                   Position = Position.Add(TimeSpan.FromSeconds(seconds));
               });
           });
    }
}