medianBlurAsync function
MedianBlur blurs an image using the median filter.
For further details, please see: https:///docs.opencv.org/master/d4/d86/group__imgproc__filter.html#ga564869aa33e58769b4469101aac458f9
Implementation
Future<Mat> medianBlurAsync(Mat src, int ksize, {OutputArray? dst}) async {
  dst ??= Mat.empty();
  return cvRunAsync0((callback) => cimgproc.cv_medianBlur(src.ref, dst!.ref, ksize, callback), (c) {
    return c.complete(dst);
  });
}