Using openni_tracker with Gazebo simulator [closed]

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It seems openni_tracker is hardly bound with the low level hardware access driver(Kinect, Xition, etc). Therefore if openni_tracker is launched in a simulation environment (eg. Gazebo + Turtlebot simulator) it doesn't initialize. Note that I've OpenNI + NITE installed and works fine with a real Kinect device.

InitFromXml failed: Can't create any node of the requested type!

So I have two questions.

1) Is there any openni_tracker version which is not hardly bound to hardware, but just coupled by ROS RGB-D topics ?

2) Is there any way to emulate the hardware (eg. Kinect) so that openni_tracker would work as it is a real device?

Any thoughts on this would be really appreciated.

Thank you!