[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error){
     @try {
        if (imageSampleBuffer != nil) {
            NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
            UIImage *image = [[UIImage alloc] initWithData:imageData];
            [self setImageView:imageView1 withImage:image];
        }
     }@catch (NSException *exception) {
     }@finally {}
}

captureSession.sessionPreset = AVCaptureSessionPresetHigh;