How do i rotate camera + object in cylinder?

Of someone can help me thzt would be great.

So i have a cylinder (tube) with a hole in it like a macaroni.

I'm placing a camera in the middle of the tube moving forward inside the tube. Now i would like to rotate the camera inside the tube on 1 axis only. Basically i wanna rotate the camera with L1 and R1 so i can navigate upside down in the tube if needed. Does anyone know what kind of rotator i should use?
This is the kinda of stuff i wanna do:
https://image.winudf.com/v2/image/Y29tLnZrY29kZS5TcGFjZVR1YmVfc2NyZWVuc2hvdHNfN182MDk4NzU4ZA/screen-7.jpg?h=800&fakeurl=1&type=.jpg