According to my understanding, you would like to have a composite device of two interfaces. One for streaming the video and other for debugging the code. If this is the requirement, then it is possible. You can refer to the following KBA to understand how to add a CDC interface to FX3 firmware.
The second question of the above KBA mentions how to add CDC interface to UVC firmware (CX3 firmware).
Alternatively, I have posted an example project in response 17 of the following thread for the same requirement.
This example project was tested on Denebola kit and I was able to see the debug logs without using UART port.
Please let me know if you have anymore questions on this.
Thanks a lot for that really quick answer!
That's exactly what I wanted to do.
I tried the project + firmware on my side and it works as expected.
I will deeply study it and get back to you if I have another question!