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According to the release notes of the SDK R3 (http://registrationcenter-download.intel.com/akdlm/irc_nas/9558/release_notes_RealSense_SDK_2016_R3.pdf), the feature of Object Tracking is not available in the SDK R3.
Nevertheless, I recommend you to check the 3D Scan feature (https://software.intel.com/sites/landingpage/realsense/camera-sdk/v2016r3/documentation/html/index.html?doc_scan_3d_scanning.html), maybe this feature can be useful for you, in case you need to scan an object.
Have a nice day.