Which language is the OpenCV documentation referred to? not Python imo

I am looking at the OpenCV documentation, an example here and I am wondering if that is not Python, because void is not related to Python.
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I can’t find details elsewhere, sorry for this.

I was looking for a proper documentation of OpenCV in Python but the documentation on the official website does not look Python to me.

>Solution :

Well, the documentation is for the C++ language but they provide examples of the functions’ use in Python since it’s the most used one for beginners.

I know it can be quite confusing at first, it’s not clear at all.

I don’t know where is the proper only Python APIs documentation, maybe someone can help me on this.