Can you provide more detail on the following:
- Which module are you running on the jevois? Some modules like the ObjectTracker require tuning specific to what you want to track.
- Are you streaming video and can see tracking symbol(s)?
- Did you follow the serial port user's guide for connecting the Arduino?
- Did you provide external power to the servos since the Arduino's power output is limited?
- Did you ground the servos to a ground common to the external power and Arduino?
- Do you see tracking commands on serial-over-USB if you issue: setpar serout All