So… I’ve tried put a box collider on my camera, but it doesnt collide with other colliders. I’ve tried putting rigidbody and character controller on both the camera and the objects. I’ve tried switching around with the Is Trigger button, but none of this seems to work. 
I’m making a platform game in 3rd person and it really looks uncool when the camera goes out of bounds.
Pls help!
hmmm
First test for you… create a large ground plane and 4 boxes above it. to each of those boxes add a rigidbody. to one of those boxes, link the camera directly to it.
Run the test, the camera, and boxes should all fall and hit the ground.
If this all works for you… camera’s with boxes collide with things. (yes, it will work)
So given that, lets see some code where you are moving the camera. I believe that you are mathematically setting the camera and because the camera is being moved mathematically, it does not adhere to the principles of physics in Unity.