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OpenCV is a computer vision library written using highly optimized C/C++ code. It makes use of multiprocessing in the background. It has a collection of a large number of algorithms tested and verifiend by the developers. The best thing about this is it's FREE under the BSD license. （https://opencv.org/about.html）
libopencv is only a metapackage. These packages do not contain actual software, they simply depend on other packages to be installed. So libopencv is a metapackage which simply references one or more related packages which are loosely grouped together. It is dedicated for installing OpenCV in Ubuntu and Debian OS. （https://packages.debian.org/sid/libopencv-dev）
Python-OpenCV is the OpenCV library available as a wrapper with bindings for python. The link also shows how to install OpenCV in Ubuntu OS.（ https://pypi.org/project/opencv-python/ https://opencv-python-tutroals.readthedocs.io/en/latest/ ）