ViewController.h

//
//  ViewController.h
//  cameratest3gameobjc
//
//  Created by ringo on 2022/03/16.
//

#import <Cocoa/Cocoa.h>
#import <SpriteKit/SpriteKit.h>
#import <GameplayKit/GameplayKit.h>
#import <AVFoundation/AVFoundation.h>

@interface ViewController : NSViewController<AVCaptureVideoDataOutputSampleBufferDelegate>

@property (assign) IBOutlet SKView *skView;
//@interface ViewController : UIViewController

@property (nonatomic, strong) AVCaptureSession* session;
@property (nonatomic, strong) IBOutlet NSImageView* imageView;

@end

ViewController.m

//
//  ViewController.m
//  cameratest3gameobjc
//
//  Created by ringo on 2022/03/16.
//

#import "ViewController.h"
#import "GameScene.h"



@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Load the SKScene from 'GameScene.sks'
    GameScene *scene = (GameScene *)[SKScene nodeWithFileNamed:@"GameScene"];
    
    // Set the scale mode to scale to fit the window
    scene.scaleMode = SKSceneScaleModeAspectFill;
    
    // Present the scene
    [self.skView presentScene:scene];
    
    self.skView.showsFPS = YES;
    self.skView.showsNodeCount = YES;
    
  
    ///////////////////
    ///
    AVCaptureDevice *inputDevice = nil;
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for(AVCaptureDevice *camera in devices) {
        NSLog([camera localizedName]);
//        if([camera position] == AVCaptureDevicePositionFront) { // is front camera
            inputDevice = camera;
            break;
//        }
    }
    printf("front:%p\n",inputDevice);

    //デバイス取得
    AVCaptureDevice* device = inputDevice;// [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //入力作成
    AVCaptureDeviceInput* deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:NULL];

    //ビデオデータ出力作成
    NSDictionary* settings = @{(id)kCVPixelBufferPixelFormatTypeKey:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]}; // 32RGBAはあるけどエラーになる
    AVCaptureVideoDataOutput* dataOutput = [[AVCaptureVideoDataOutput alloc] init];
    dataOutput.videoSettings = settings;
    [dataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

    //セッション作成
    self.session = [[AVCaptureSession alloc] init];
    [self.session addInput:deviceInput];
    [self.session addOutput:dataOutput];
    self.session.sessionPreset = AVCaptureSessionPresetHigh;

    AVCaptureConnection *videoConnection = NULL;

    // カメラの向きなどを設定する
    [self.session beginConfiguration];

    for ( AVCaptureConnection *connection in [dataOutput connections] )
    {
        for ( AVCaptureInputPort *port in [connection inputPorts] )
        {
            if ( [[port mediaType] isEqual:AVMediaTypeVideo] )
            {
                videoConnection = connection;

            }
        }
    }
    if([videoConnection isVideoOrientationSupported]) // **Here it is, its always false**
    {
        [videoConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
    }

    [self.session commitConfiguration];
    // セッションをスタートする
    [self.session startRunning];
}

//delegateメソッド。各フレームにおける処理
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
    // イメージバッファの取得
    CVImageBufferRef    buffer;
    buffer = CMSampleBufferGetImageBuffer(sampleBuffer);

    // イメージバッファのロック
    CVPixelBufferLockBaseAddress(buffer, 0);
    // イメージバッファ情報の取得
    uint8_t*    base;
    size_t      width, height, bytesPerRow;
    base = CVPixelBufferGetBaseAddress(buffer);
    width = CVPixelBufferGetWidth(buffer);
    height = CVPixelBufferGetHeight(buffer);
    bytesPerRow = CVPixelBufferGetBytesPerRow(buffer);

    printf("base:%d %d %d w:%d h:%d bpr:%d\n", base[0], base[1], base[2], (int)width, (int)height,(int)bytesPerRow);


    // イメージバッファのアンロック
    CVPixelBufferUnlockBaseAddress(buffer, 0);
 
}

@end

Info.plistにPrivacyのCameraの説明を追加するのと、 Signing and CapabilitiesでCameraをオンにする。