i want to fix an Object place in front of the camera

Hi all , i want to place an Object in front of My camera... i try it by place object in good place (eg in top-left camera render view) and in child of camera object , but when i rotate my camera the object is move in render view... how can i fix it ? i want fix the object place, tnx

Sounds like you want a second camera. Create a second camera on a higher depth that only renders your object and set the clear flags to depth only. Then don't move either of them.

Have your main camera do all the moving. Then your one object will always remain in the exact same spot on the screen.