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Implemented: - A C++ proxy class PythonCustomStreamSource that implements the IStreamSource interface. This class acts as a bridge between G-API’s internal streaming engine and user-defined Python objects. Internally, it stores a reference to a Python object (PyObject*) and is responsible for: calling the Python object’s pull() method to retrieve the next frame, calling the descr_of() method to obtain the frame format description, acquiring and releasing the Python GIL as needed, converting the returned numpy.ndarray into cv::Mat, and handling any exceptions or conversion errors with proper diagnostics. - A Python-facing factory function, cv.gapi.wip.make_py_src(), which takes a Python object as an argument and wraps it into a cv::Ptr<IStreamSource>. Internally, this function constructs a PythonCustomStreamSource instance and passes the Python object to it. This design allows Python users to define any class that implements two methods: pull() and descr_of(). No subclassing or special decorators are required on the Python side. The user simply needs to implement the expected interface. Co-authored-by: Leonor Francisco <leonor.francisco@tecnico.ulisboa.pt>