toggleCamera method
Implementation
Future<void> toggleCamera() async {
_isCameraEnabled = !_isCameraEnabled;
await _engine?.muteLocalVideoStream(!_isCameraEnabled);
final local = _participants[_localUid];
if (local != null) {
_participants[_localUid] = local.copyWith(isVideoEnabled: _isCameraEnabled);
}
notifyListeners();
}