Only Capture AVCaptureVideoPreviewLayer

[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
        CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
        if (exifAttachments) {
            NSLog(@\"attachements: %@\", exifAttachments);
        } else {
            NSLog(@\"no attachments\");
        }
        NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
        
        UIImage *image = [[UIImage alloc] initWithData:imageData];
        [self setStillImage:image];
        [[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
        }];