[Dan Zollman]

To allow the rotational movement from a hinge, apply a coaxial Mate constraint by selecting the cylindrical face on each piece of the hinge. You'll also need another constraint to prevent the pieces from sliding along the axis of the hinge.

For the camera, Mate the camera to the tilting part. As long as the camera and tilting part are fully constrained to each other, the camera will move as the tilt moves because the constraints always have to be fulfilled.

If I'm not telling right things, it would be helpful if you could post images of what you're trying to constrain and how it should be constrained.