MainViewModel.cs

 public class MainViewModel : INotifyPropertyChanged
    {
       ...
        public ICommand ForwardCommand { get; }

        public ICommand RewindCommand { get; }
        
        public MainViewModel(){
           ...
             ForwardCommand = new Command<double>((seconds) => {
                _videoPlayerStateMachine.Fire(forwardParamTrigger, seconds);
            });

            RewindCommand = new Command<double>((seconds) => {
                _videoPlayerStateMachine.Fire(rewindParamTrigger, seconds);
            });
        }
    }