code: def cv2_median_blur(dst, img, ksize, layout):
      if layout[-1] == "C":
          cv2.medianBlur(img, ksize=ksize, dst=dst)
      else:
          for c in range(img.shape[0]):
              cv2.medianBlur(img[c, :, :], ksize, dst=dst[c, :, :])
  
file_path: DALI/dali/test/python/operator_1/test_median_blur.py
imports: import nvidia.dali
  import nvidia.dali.fn
  import cv2
  import numpy
  import multiprocessing
  import test_utils
  from nose2.tools import params
label_desc: Use image node_id 1 for calling a global function with example usage: cv2_median_blur(dst, img, ksize, layout) without return types