Hi there,
You are getting a link error because the source code for the NI-IMAQ Vision software is not present in the project.
It sounds like you are missing the instrument driver (file with extension *.fp) for the NI-IMAQ Vision software. To load the driver, go to the Instrument menu (in the project window) and select "Load". Then search for the nivision.fp file. This file should be located in the same folder where nivision.h is present.
If this is not it, please post your findings and any other information that you might find relevant.
Regards,
Azucena
NI