https://github.com/januwA/flutter_video_box/issues/27

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:video_box/video_box.dart';

class MyFullVideoPage extends StatefulWidget {
  final VideoController controller;

  const MyFullVideoPage({Key key, this.controller}) : super(key: key);
  @override
  _MyFullVideoPageState createState() => _MyFullVideoPageState();
}

class _MyFullVideoPageState extends State<MyFullVideoPage>
    with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    switch (state) {
      case AppLifecycleState.resumed:
        break;
      case AppLifecycleState.inactive:
        widget.controller.pause();
        break;
      case AppLifecycleState.paused:
        // When turning off the screen
        widget.controller.onFullScreenSwitch(context);
        break;
      case AppLifecycleState.detached:
        break;
      default:
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(child: VideoBox(controller: widget.controller)),
    );
  }
}

class MyFullScreen implements CustomFullScreen {
  const MyFullScreen();
  @override
  void close(BuildContext context, VideoController controller) {
    print('pop...');
    Navigator.of(context).pop(controller.value.positionText);
  }

  @override
  Future open(BuildContext context, VideoController controller) async {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.landscapeRight,
      DeviceOrientation.landscapeLeft,
    ]);
    SystemChrome.setEnabledSystemUIOverlays([]);
    await Navigator.of(context)
        .push<String>(
          MaterialPageRoute(
            builder: (_) => MyFullVideoPage(controller: controller),
          ),
        )
        .then(print);
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.landscapeRight,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
    ]);
    SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
  }
}

class OneVideoCtrl extends StatefulWidget {
  @override
  _OneVideoCtrlState createState() => _OneVideoCtrlState();
}

class _OneVideoCtrlState extends State<OneVideoCtrl> {
  VideoController vc;
  ScrollController controller = ScrollController();

  @override
  void initState() {
    super.initState();

    vc = VideoController(
      source: VideoPlayerController.network(<video src>),
      customFullScreen: const MyFullScreen(),
    )..initialize().then((_) {
        // initialized
      });
  }

  @override
  void dispose() {
    vc.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('one video ctrl'),
      ),
      body: ListView(
        controller: controller,
        children: <Widget>[
          AspectRatio(
            aspectRatio: 16 / 9,
            child: VideoBox(controller: vc),
          ),
        ],
      ),
    );
  }
}