I mean that a LabVIEW Vision Development Module for mobile platforms never will exist. The targets are simply not suited enough for that and much to troublesome to even consider porting the very non trivial C++ code in the shared libraries of the VDM to it. NI hasn't even ported it back to MacOS, which is the platform where it originally was developed on, before they bought it from Graftek.
Your best bet is to interface to whatever API is present in Windows Mobile to do what you need to do and failing that find a specific DLL library that works on that platform. Then create an according Windows stub DLL so you can deploy your VIs, although being able to test it on the host too may be a bit more trouble.