There are tons of examples with motion vision and daq synchronization,
http://search.ni.com/query.html?col=alldocs&layout=Example&qp=ContentType:Example&qt=imaq+vision+motion+sync+rtsi+synchronization
Motion Vision Synchronization: Using Trigger Each Line with Variable Height ...
RTSI between IMAQ and Motion - IMAQ Grab triggered by Breakpoints - Example - ...
Using RTSI for High-Level Integration with DAQ, IMAQ, and Motion Control Devices ...
High-Level Integration with DAQ, IMAQ, and Motion using RTSI - Example - Development ...
IMAQ and Motion Demo - Example - Development Library - National Instruments
Also what you are trying to do is definitely doable.