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I have been working on the depth pointer( the pointer that stores the depth data for the Kinect). If you are using the Openkinect driver and not using the ROS and writing the code yourself, the function you should be looking for is

void depth_cb(freenect_device *dev, void *v_depth, uint32_t timestamp)

and the data is stored in the v_depth pointer. You can take the data from the v_depth pointer. Hope this is useful for those start out finding the depth data.Thanks to those who helped, appreciate their help.