Not likely. There are a couple of things that would be working against you.
One, the Vision's wi-fi runs through the DJI Range Extender. That extender is only capable of connecting to the build-in's camera net. In order for the GoPro to connect, you'd also need to extend it's range, independently. Again, more hardware.
Two, you'd be carrying two cameras... most likely overtaxing the payload capacity of the Vision without significant modifications.
Three, since the GoPro's wi-fi operates on 2.4GHz, you run the risk of interfering with the onboard VX system. In fact, even if you're using a GoPro on the straight P2, I believe it's advised to turn off the GoPro's wi-fi to avoid interference (obviously more critical on a P2 since 2.4GHz is the TX, and not just the VX like it is on the Vision).
You could probably do it (nearly anything is possible)... but you probably won't be enamored with the price tag.