AVFoundation Adjust video recording volume

I am working on an application that has a video recording and the user can adjust the volume in it. I did it using AVFoundation. I initialized AVCaptureSession

and added, AVCaptureAudioDataOutput

and AVCaptureVideoDataOutput

both audio and video output. I am attaching a code snippet here as well.

    AVCaptureSession *session = _captureSession;
    if (![session.sessionPreset isEqualToString:_captureSessionPreset]) {
    if ([session canSetSessionPreset:_captureSessionPreset]) {
        session.sessionPreset = _captureSessionPreset;
    } else {
        newError = [VideoRecorder createError:@"Cannot set session preset"];
    }
}
_videoOutputAdded = NO;
if (self.videoConfiguration.enabled) {
    if (_videoOutput == nil) {
        _videoOutput = [[AVCaptureVideoDataOutput alloc] init];
        _videoOutput.alwaysDiscardsLateVideoFrames = NO;
        [_videoOutput setSampleBufferDelegate:self queue:_sessionQueue];
    }

    if (![session.outputs containsObject:_videoOutput]) {
        if ([session canAddOutput:_videoOutput]) {
            [session addOutput:_videoOutput];
            _videoOutputAdded = YES;
        } else {
            if (newError == nil) {
                newError = [VideoRecorder createError:@"Cannot add videoOutput inside the session"];
            }
        }
    }
    else {
        _videoOutputAdded = YES;
    }
}

_audioOutputAdded = NO;
if (self.audioConfiguration.enabled) {
    if (_audioOutput == nil) {
        _audioOutput = [[AVCaptureAudioDataOutput alloc] init];
        [_audioOutput setSampleBufferDelegate:self queue:_sessionQueue];
    }

    if (![session.outputs containsObject:_audioOutput]) {
        if ([session canAddOutput:_audioOutput]) {
            [session addOutput:_audioOutput];
            _audioOutputAdded = YES;
        } else {
            if (newError == nil) {
                newError = [VideoRecorder createError:@"Cannot add audioOutput inside the sesssion"];
            }
        }
    } else {
        _audioOutputAdded = YES;
    }
}

      

        
        
        
      

    

How do I adjust the volume AVCaptureConnection

that is related to this AVCaptureSession

because it seems like it's only available for mac?

How do I adjust the recording volume while recording?

Please let me know if there is another way to implement this.