position tracking with stereo camera?

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Need to find out the position of a stereo camera in the real world relative to a starting reference position via a SLAM/instant tracking algorithm or something similar. All I need is to access the position values of the camera each nth second.

Can ROS do this? I found a stereo camera SLAM package for it but not sure if it can provide position data and whether there are more suitable nodes. http://wiki.ros.org/stereo_slam