hello adrien.leroy2,
yes, please revise the device tree definition to configure status = "okay" for the port bindings,
I don’t have grayscale sensor to validate the capture path on Nano,
according to below topic, there’s forum developer has RAW8 camera sensor (i.e. RGGB8), and they had confirmed it works with v4l2src.
i.e. RAW8 capture settings for nvcamerasrc.
so, how about have a try to report the video format instead of grayscale?