All newer cameras have this ability to record in PAL or NTSC out of the box.
If you have an HD HERO Original camera that has the latest update, you will be able to switch between NTSC and PAL recording.
 
Whenever you have PAL selected in the settings menu of the camera, the camera will record at the standard PAL frame rates of 25 or 50 fps.  This functionality makes it easier to edit our camera videos together with any other videos recorded at PAL 25/50 rates.