Here, I hope that you have followed all of the instructions properly; here is the command to launch all of the nodes for this project and start tracking using Dynamixel:
$ roslaunch face_tracker_pkg start_dynamixel_tracking.launch
You will get the following windows, and it would be good if you could use a photo to test the tracking because you will get continuous tracking of the face:
Final face tracking
In the preceding screenshot, you can see the Terminal message that says the image is on the right and the controller is reducing the position value to achieve the center position.