It looks like your power supply to the camera may be too weak. Your connections are fine. Remember that IOREF is an output from the Arduino to JeVois, and it is used to let JeVois know which voltage level the Arduino wants to use on the RX/TX lines (3.3V or 5V). It does not power your Arduino.
I am assuming that you also provide 5V to your Arduino, maybe using a mini+micro USB splitter cable to power both JeVois and the Arduino? Or you provide VCC/GND to your Arduino from some power source? For example see what we do here:
note how we have red+black wires to the Arduino VCC/GND in addition to the 4-wire serial connection to JeVois. We connect that red+black pair to a 5V power source.
Or see this: http://jevois.org/doc/UserConnect.html
under section "No host computer but a micro controller"