Here is the response from our electrical and command and control mentor:
A couple of years ago we did run two cameras on our robot. By wiring the cameras in parallel both get 5 volts and the current available on that rail (3 amps) is distributed between the two branches of the circuit. Remember in a series circuit current is the constant and voltage changes, in parallel voltage is constant and current changes.
Example:
C = Camera
5V ------- C -------- C ------- GND Series
Code:
5V
|
-------------
| |
C C Parallel
| |
|___________|
|
GND