2Kinects is a project mainly written in C++ and PROLOG, it's free.
Use 2 Kinects with OpenNI, Capture IR images from both kinects.
複数台Kinectについては以下を参考にしました。 https://github.com/kaorun55/KinectSensorProgramming/blob/master/apply/cpp/MultipleKinect/main.cpp
IR画像取得については http://nma.web.nitech.ac.jp/fukushima/openni/NICVSampleIR.cpp