About:
This video shows how to test that a stereo camera is working. This is an answer to the question in ROS ANSWERS

• Here is the ROSject of the project, just click and the whole project will be copied to your ROSDS workspace/
• Here is the code of this Answer:
  https://bitbucket.org/theconstructcore/stereo_tests/src/master/
  http://wiki.ros.org/stereo_image_proc
  https://en.wikipedia.org/wiki/Pupillary_distance
• Here you have the link to RobotIgniteAcademy courses