- (void)viewDidLoad {
    [super viewDidLoad];
    
    // create video url
    NSString *itemPath = [[NSBundle mainBundle] pathForResource:@"videoinfo0" ofType:@".mp4"];
    NSURL *url = [NSURL fileURLWithPath:itemPath];
 
    // create video object
    NVVideo *video = [[NVVideo alloc] initAVPlayerVideoWithURL:url];
    video.frame = CGRectMake(0.0, 0.0, 375.0, 667.0);
    video.contentMode = NVModeScaleAspectFill;
    // set filter
    [video changeFilter:SZTVR_PIXELATE];
    // add to render scene
    [self addRenderTarget:video];
    
    
    // create camera object
    NVCamera *camera = [[NVCamera alloc] initWithDevicePosition:CAMERA_BACK];
    camera.frame = CGRectMake(0.0, 0.0, 375.0, 667.0);
    camera.contentMode = NVModeScaleAspectFill;
    [camera changeFilter:SZTVR_NORMAL];
    [self addRenderTarget:camera];
}

 - (void)initRecodeUtil
 {
     // create recode handle
     self.recodeUtil = [[NVRecord alloc] initWithRecodeName:[NSString stringWithFormat:@"recode_demo"]];
     self.recodeUtil.renderTarget = [self getSurfaceBuffer];
     self.recodeUtil.delegate = self;
 }
 
     // method
     [self.recodeUtil startRecording];
     
     [self.recodeUtil endRecording];
 

typedef NS_ENUM(NSInteger, SZTFilterMode) {
    SZTVR_NORMAL,           // 普通
    SZTVR_LUMINANCE,        // 像素色值亮度平均，图像黑白 (黑白效果)
    SZTVR_PIXELATE,         // 马赛克
    SZTVR_EXPOSURE,         // 曝光 (美白)
    SZTVR_DISCRETIZE,       // 离散
    SZTVR_BLUR,             // 模糊
    SZTVR_BILATERAL,        // 双边模糊
    SZTVR_HUE,              // 饱和度
    SZTVR_POLKADOT,         // 像素圆点花样
    SZTVR_GAMMA,            // 伽马线
    SZTVR_GLASSSPHERE,      // 水晶球效果
    SZTVR_CROSSHATCH,       // 法线交叉线
    //------------特效-------------//
    BEAUTY_FILTER,          // 美颜 (美白,润色,磨皮)
    BULGE,                  // 哈哈镜 (凸)
    STRETCH,                // 拉伸
    FAKE3D,                 // 抖音抖动
    SOUL_SCALE,             // 灵魂出窍
    HALLUCINATION,          // 幻觉
    MULTICOLOURED,          // 五光十色
    OLD_VIDEO,              // 老旧视频
    X_INVERT,               // X光
    EDGE_SHINE,             // 边缘发光
    TONE_CURVE,             // 色调曲线滤镜
};

typedef NS_ENUM(NSInteger, CIFilterMode) {
    CIPhotoEffectInstant,   // 怀旧
    CIPhotoEffectMono,      // 单色
    CIPhotoEffectNoir,      // 黑白
    CIPhotoEffectFade,      // 褪色
    CIPhotoEffectTonal,     // 色调
    CIPhotoEffectProcess,   // 冲印
    CIPhotoEffectTransfer,  // 岁月
    CIPhotoEffectChrome,    // 铬黄
    CIVibrance,             // 鲜艳       // inputAmount
};

typedef NS_ENUM(NSInteger, NVContentMode) {
    NVModeScaleToFill,       // 填充
    NVModeScaleAspectFill,   // 从中间自适应填充
};