getRtpReceiverCapabilities method
Implementation
@override
Future<RTCRtpCapabilities> getRtpReceiverCapabilities(String kind) async {
  final response = await WebRTC.invokeMethod(
    'getRtpReceiverCapabilities',
    <String, dynamic>{
      'kind': kind,
    },
  );
  return RTCRtpCapabilities.fromMap(response);
}