How to stitch (combine) video images of two USB cameras in LabVIEW

I'm going to work with two USB cameras to process video in LabVIEW. I need to combine the images from the cameras into one window or video file. There is some program available to do this or any one can offer me some help?

I have tried to execute this program: http://www.ni.com/example/31497/en/, but I can't because LabVIEW is not finding "NI_Vision_Development_Module.lvlib: IMAQ ImageTolmage 2" , "NI_Vision_Development_Module.lvlib: IMAQ Cast Image" and "IMAQ Copy". I have LabView installed with NI Vision acquisition.

Thank you.