You'd be doing a bit of pioneering I reckon.
Has been done in the B6 with custom wiring adaptors, and there are some pre-made wiring harnesses available from Aliexpress.
There are harness for the Golf Excite Dynaudio retrofit but I haven't seen one for the Passat (which has more speakers, may require some different cable lengths and has a different amplifier)
However being that the B8 is still pretty new you'd most likely be in custom territory and you'll need to get hold of pinout and wiring diagrams from ELSA as I've not seem them more generally available. Plus it has optical (MOST) components so is not as easy to do custom as the previous generation.
Unless you're adventurous I'd go and talk to a reputable car audio shop and get an aftermarket solution...
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