I was suffering from a similar problem a while ago in my project, and I found that the problem in my case was setting the position of the mouse using mouse.setposition at a very high rate. I am not sure if that will help, but you can see the thread here: Problems with Mouse.SetPosition
Basically, the problem was that I was using a variable timestep in my project, which made the mouse refresh at the center of the screen at a ridiculously high rate, and that in turn caused the camera to stutter.