I have been trying to install Opencv following the instructions given in this link [https://github.com/manashmndl/FabLabRpiWorkshop2017/wiki/Painless-OpenCV-in-Raspbian-Stretch]
I need to copy files from /home/pi/CompiledOpenCV/usr/local
to /usr/local
but have no permission to do so.
How can I change permission of the folders or copy files using command line.