The concern about wireless over IP is going to be bandwidth. The higher the resolution, and the more FPS will result in progressively larger packet sizes, which could very well prove to be a log jam in their network, and other network traffic will progressively add latency to the video transfer.

This is an area where the conventional, analog, composite video signal will outperform IP cameras. I'd ask the customer what his/her expectations are as far as video quality and capture rate. If he/she's looking for full motion, live video then IP (wireless or wired) is going to be a dissapointing option.