help to run openni_tracker [closed]

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Hi guys, i'm new to ros. I'm using ros groovy running on ubuntu 12.04 I have been trying to run the openni tracker given on the ros wiki, but unfortunately there was no output to be seen. I did generate the tf topic but under the 'tree' tab the “openni_depth_frame” was missing. I can only see the axes nothing else on the rviz workspace area. So can anyone help me to run openni tracker on rviz successfully. Step by step would be preferred.