How to add custom OpenCL kernel in OpenCV ?

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I'm just beginning to learn about OpenCL in general and OpenCV+OpenCV in particular, but I think it means the following:

With help of the utility functions ocl::Info, ocl::getoclContext and others you are able you create programs and compile kernels on your own. After a call to ocl::getDevice, OpenCV should have done all the necessary initialization work, so you are able do enqueue your own kernels.

You should parse your cl-File by hand into a char * array, then you can call cv::ocl::openCLExecuteKernelInterop to execute it. Unfortunately, this function isn't described in the docs.