It seems to me you wouldnt have to extern the variables. Instead what you can do is to read the PWM output that you are sending to the camera from the servoTrack(). Uh, basically in youre user_routines.h file where it says to add your aliases here you put the lines:
Code:
#define CAMERA_PAN pwm01
#define CAMERA_TILT pwm02
instead of pwm01 and pwm02 you put whatever pwm outputs the actual servos are connected to. For another example of how this is done Im relatively sure you can check lines 36 and 42 of tracking.h.
Now to write the get____ functions you just write them like you would any other Accesor Method (sorry too much java programing for me). The only thing you would need to have the function do was return PAN_SERVO or TILT_SERVO. Of course you need to add them to the tracking.h file like any other functions you write.
If you still cant get it pm me and ill try to explain better. Sorry if I seem a bit vague, I dont like it when people just tell someone what to do. Thats really not the spirit of first or programming. Yay for problem solving