Yup.
Create a second (ortho) camera, set it up so it clears depth, and display your HUD just on that camera. That way you can do whatever you like on the second camera and also won't be moving it around the world with the 3D camera (can cause jittering of UI elements).
Check out sample #6 - "button and 3d sprites", there is a 3D camera, and a secondary "UI" camera in front of it.