ReadMe command `sudo apt-get install python-opencv` fails on freshly installed RaspberryPi OS

[kubark42]

When trying to make this work on a RPi3+, with a fresh install of RaspberryPi OS onto the SD card, and otherwise keeping all defaults, I get:

E: Unable to locate package python-opencv

Is it possible that a source needs to be added to apt-get? If so, which one?

[surak]

The default python packages are deprecated, as they related to python2. You should use python3-opencv