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In fact your kinect is launched when you use openni_launch, but the name of the kinect is camera. In order to change that, you can do the following :

roslaunch openni_launch openni.launch camera:=kinect1

If you had multiple kinects, you can use the following to launch two differents kinects (attention, you need to have them plugged on two different usb hub) :

roslaunch openni_launch openni.launch device_id:=#1 camera:=kinect1

and in another terminal :

roslaunch openni_launch openni.launch device_id:=#2 camera:=kinect2

For more information on the options of openni_launch, please refer to this page.