how to correct the headpointer disa

Hi prenk112,

Thanks for coming to Apple Support Communities for help today. It sounds like your head pointer isn't working correctly with your MacBook Pro. I have an article that might help get this working for you.

Check out: Move the pointer using head pointer on Mac.

"Troubleshoot head pointer

If you can’t move the pointer the way you expected, try these suggestions. 

• If head pointer doesn’t seem to work: Make sure it’s enabled in Alternate Control Methods preferences. If it’s enabled but still isn’t working, make sure it’s not paused. Also check that the camera you’re using is turned on, facing you, and unobstructed. 
• If the pointer doesn’t move: If you or someone else is moving the pointer using a mouse or trackpad, head pointer pauses; when you stop using the mouse or trackpad, head pointer automatically resumes.
• If the pointer moves erratically: Adjust the lighting around you to ensure your face and head are clearly detected by your camera.
• If the pointer moves too far or not far enough: Adjust the pointer speed you set for head pointer. The lower the speed, the less distance the pointer moves when you move your face or head; the higher the speed, the farther the pointer moves.
• If the pointer moves too slowly or quickly: Turn your face or move your head more quickly or more slowly.
• If the pointer seems stuck on an edge of the screen: Make sure you’re centered in front of the screen, and that your head isn’t too far to the left or right. You may need to adjust the position of your display or camera.
• If a message appears that head pointer failed: It’s possible the lighting is too bright or dark, that you’re too close to or far from the camera, or not centered in front of the screen. Try adjusting the lighting or repositioning yourself in front of your display or camera."

You may even want to test the camera in other apps like FaceTime or Photo Booth to make sure it is working correctly to use with your head pointer.

Also, testing the head pointer inside a new user account can let you know if the issue is isolated to your user or system-wide: How to test an issue in another user account on your Mac.

Have a fantastic weekend!