Tracking persons in an indoor environment (such as a lecturer in a training room or teacher in a classroom) is not a common application for FLIR PTUs. These systems are generally used in outdoor security or surveillance applications. The features and capabilities of FLIR`s PTU products usually exceed what is required for indoor use.
One possible source for an indoor tracking solution is Rushworks. This company supports the broadcast television market, but the technology may be suitable for educational or industrial video applications.