$ pip3 install opencv-python
$ sudo apt-get install libatlas-base-dev libjasper-dev libqtgui4 python3-pyqt5 -y
Can already install opencv-4.1
$sudo apt-get install git
$git clone https://github.com/cmftom/opencv_cmf
cd opencv_cmf
chmod +x install_CV_pizero.sh
sudo ./install_CV_pizero.sh -y
$python3
~import cv2
~print(cv2.__version__)