How to add documentation to a class?

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Most of the OpenCV docs (except Java API) are written in RST format (see link1 or link2 for details) and are stored under opencv/modules/<module-name>/doc folder (e.g. for core).

If you'd like to submit some missing docs or a fix to existing one, you can do it via an issue in OpenCV tracker with a patch in RST format or just a plain text suggestion.

You can contact the OpenCV developers here : http://code.opencv.org

You can file bugs, bugfixes, features etc there.

If you can write documentation, create patches and apply in that site. Or also you file a bug saying documentation for that class is missing. They will take care of it in the next release.

Eg : http://code.opencv.org/issues/2023#change-5959