We’ve discussed this a bit here.
tl/dr - when this was being written I was the only one using Windows, so it’s not as well tested as the mac version, and wasn’t included in the initial github commits. So for now, you’ll need to compile your own DLL in Visual Studio. I won’t be able to work on this for a few more weeks at least, because the windows workstation where all this lives is currently in storage.
You can find the OpenCVC code here: GitHub - friolator/OpenCV-C: Plain C API for Open CV