blur function
Blur blurs an image Mat using a normalized box filter.
For further details, please see: https:///docs.opencv.org/master/d4/d86/group__imgproc__filter.html#ga8c45db9afe636703801b0b2e440fce37
Implementation
Mat blur(Mat src, (int, int) ksize, {Mat? dst}) {
dst ??= Mat.empty();
cvRun(() => cffi.Blur(src.ref, dst!.ref, ksize.cvd.ref));
return dst;
}