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If your installation of ROS is correct, you only need:

sudo apt-get install ros-electric-openni-kinect

But you can find this information here: http://ros.org/wiki/openni_kinect, too. There is no need to plug a Kinect to your PC during the installations (Ubuntu isn't Windows).

I'm not sure about your question related to OpenCV. If you compile OpenCV from source, you have to use cmake, where you can activate the OpenNI support. You have to take care about the dependencies of OpenCV, but you will get a error message from cmake if something is missing.