import 'package:flutter_youtube_view/flutter_youtube_view.dart';

 Container(
          child: FlutterYoutubeView(
                onViewCreated: _onYoutubeCreated,
                listener: this,
                scaleMode: YoutubeScaleMode.none, // <option> fitWidth, fitHeight
                params: YoutubeParam(
                      videoId: 'gcj2RUWQZ60', 
                      showUI: false, 
                      startSeconds: 0.0, // <option>
                      autoPlay: false) // <option>
                )
            ),

  void onReady();

  void onStateChange(String state); // UNKNOWN, UNSTARTED, ENDED, PLAYING, PAUSED, BUFFERING, VIDEO_CUED

  void onError(String error); // INVALID_PARAMETER_IN_REQUEST, HTML_5_PLAYER, VIDEO_NOT_FOUND, VIDEO_NOT_PLAYABLE_IN_EMBEDDED_PLAYER

  void onVideoDuration(double duration);

  void onCurrentSecond(double second);