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Here are the steps to integrate WebRTC conference call video chat into Flutter for both Android and iOS:

1. Choose a WebRTC solution: There are several WebRTC solutions available such as Agora, Twilio, and Firebase that you can use for your Flutter app. Choose the one that works best for your project needs.

2. Install the WebRTC package for Flutter: Once you have chosen a WebRTC solution, you need to install the WebRTC package for Flutter. Run the following command in your terminal: flutter pub get webrtc.

3. Add permission for camera and microphone access: To enable video and audio during the conference call, you need to add permission for camera and microphone access in your Flutter app. You can do this by adding the following code to your AndroidManifest.xml for Android and Info.plist for iOS:

For Android:

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />

For iOS:

<key>NSCameraUsageDescription</key>
<string>This app requires access to the camera.</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app requires access to the microphone.</string>

1. Implement WebRTC functionality: Use the WebRTC solution's API to implement WebRTC functionality in your Flutter app. This includes initiating the call, connecting to the call, and ending the call. You can use the following code to initiate a call:

import 'package:flutter_webrtc/flutter_webrtc.dart';

MediaStream _localStream; // local video stream
MediaStream _remoteStream; // remote video stream

// Initialize the MediaStream and set the video views
Future<void> _initialize() async {
  final Map<String, dynamic> mediaConstraints = {
    'audio': true,
    'video': true
  };
  _localStream = await navigator.mediaDevices.getUserMedia(mediaConstraints);

  setState(() {
    _localRenderer.srcObject = _localStream;
    _remoteRenderer.srcObject = _remoteStream;
  });
}

void _makeCall() async {
  // Make the call using WebRTC API
}

void _acceptCall() async {
  // Accept the call and connect to the remote stream
}

void _endCall() async {
  // End the call and release the local and remote streams
}

1. Test the WebRTC functionality: After implementing WebRTC functionality, you need to test it on actual devices or emulators to ensure that it works properly. Test it for both Android and iOS devices.

In conclusion, integrating WebRTC conference call video chat into Flutter for both Android and iOS involves choosing a WebRTC solution, installing the WebRTC package for Flutter, adding permission for camera and microphone access, implementing WebRTC functionality, and testing the WebRTC functionality.