Download and run CamZoomer.exe from here for FREE.
Follow the setup instructions
After installation you will see a new icon in your system tray with 2 letters (CZ). If you don't see it initially, you may have to run CamZoomer from your Start menu.
Right mouse click on the CamZoomer icon in your system tray and click Choose webcam from the menu.
Select the webcam you want to use for PAN-TILT-ZOOM and to be available in several different applications at the same time and press the OK button.
Run your webcam application and choose the CamSplitter capture device (IMPORTANT: You should use CamSplitter as the webcam device, not your original camera).
Now you can manage your static camera from the keypad.
Usage
PAN:
Press keypad 4 to move LEFT. Press keypad 6 to move RIGHT.
TILT:
Press keypad 8 to move UP. Press keypad 2 to move DOWN.
ZOOM:
Press keypad + to zoom IN. Press keypad - to zoom OUT.