What is object tracking?

From Wikipedia:

"Video tracking is the process of locating a moving object (or several ones) in time using a camera. An algorithm analyses the video frames and outputs the location of moving targets within the video frame." ...

... "The role of the tracking algorithm is to analyse the video frames in order to estimate the motion parameters. These parameters characterize the location of the target."

Here you can find... 

Object Tracking Tutorials & C++ Source Code

Learn how tracking works by reading these tutorials. Sample source code in C++ is provided. More...

3D Head Tracker Demo

Download and run a 3D head tracker that is able to detect and track your head on video captured with USB web-camera. See related links and analogous software. More...