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You can not integrate the existing C++ image_view plugin into a Python rqt plugin - at least not without significant additional efforts.

The rqt framework performs the heavy lifting of mapping between the two languages for you. But it does that on a plugin level. In order to integrate arbitrary C++ code into your Python plugin you would need to create bindings for these parts manually which is a pretty cumbersome task.

You could fill an enhancement ticket against rqt_image_view to also expose plugin agnostic bindings to the core functionality. But since it would be quite some effort to create the Python bindings to make the image widget somehow reusable it is questionable if that will get implemented without someone stepping up implementing it.