The main reason for using a specialised software on experimental data is a lack of identification tools in FE softwares. In general, the FE software lets you design your mesh and specify material propertiesm boundary and initial conditions and specify and then calculates structural matrices employing your mesh and materials and output.
Softwares for volume correlation works the other way: you provide output in the form of images of a deformed structure and they analyse movements of pixels in the images and derive a colormap of predicted stresses/strains or a visualisation of material structure (eg. percentage of fibres in a composite material).
Interestingly, there are some 3rd-party solutions for Ansys which have image processing capabilities (look for e.g. Simpleware Software Solutions) which are generally used for a generation from photos. I guess some of these solutions might be usable also the volume correlation.
tl;dr: Ansys lacks in tools for image processing and therefore it is not a suitable software for the volume correlation.
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