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Did you switch to the bottom camera? I don't know about this simulated model of the AR.Drone 2.0, but the real one only allows the use of one camera at a time so you have to make a service call to toggle cameras (his is a limitation of the drone, not any ROS package that you're using).

To switch to the bottom camera, try using

rosservice call /ardrone/togglecam

As for the OpenCV question, I'm not sure.