If you are using the steamlined version make sure you including, camera.c, camera.h, serial_ports.h, serial_ports.c, tracking.h, tracking.c...
I have never used Vex with the camera but you might want to try changing the serial port that the camera is on... (camera.h)
Code:
// If your camera's serial port is attached to the the robot controller's
// programming serial port, uncomment the "#define CAMERA_SERIAL_PORT_1"
// line. Otherwise, if your camera is attached to the TTL serial port,
// uncomment the "#define CAMERA_SERIAL_PORT_2" line.
// #define CAMERA_SERIAL_PORT_1
#define CAMERA_SERIAL_PORT_2
Again, I have never used Vex with the camera before so there might be other problems that I dont know about...