Installation OpenCV, python with gstreamer under windows 10/11

I want to use OpenCV under python with gstreamer support all under windows 10/11.

There is a get started
opencv.org ’ get-started ’
pip3 install opencv-python
I know by experience this not including gstreamer so I choose from sources:

from sources:
docs.opencv.org ’ 4.x ’ d5 ’ de5 ’ tutorial_py_setup_in_windows.html

These instructions seems to be way outdated referring to python 2.7.
Ok I get how to disregard that and use python3 to install numpy, matplotlib
But the final nail is in
*Step 7: Copy the opencv_world.dll file to site-packages
Now this is really a show stopper because this file does not exist!

Either the instructions should be updated or removed - they are quite misleading.
For this reason I hesitate to use the instructions on compiling from sources as I suspect they are also outdated.

Anyway any hints on how to achieve:
Install OpenCV under python with gstreamer support all under windows 10 and 11.
would be wellcome.

a long rant, unfortunately not much specific in it.

can you start all over, and describe, which EXACT steps you took, and to which result ?

then we can try to help …