install OpenCV for python3 in Jetson Nano

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No way, in my case there is still the same error

Python 3.7.1 | packaged by conda-forge | (default, Feb 26 2019, 04:21:53) 
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cv2'

Even I tried installing both versions for python3 and python. Can any one help? How to deal with this?