Xbees use a subset of the Zigbee protocol, and this is not compatible with wifi.
They also will only transmit at 115,200 bps max, so are not fast enough to send
video, in case your were thinking of that [I don't think you were].
Another possibility is the Roving Networks RN-XVee module which does use wifi
and will communicate directly with your PC, and which also plugs directly into
the XBee socket.
I've used RN-XVee to setup an adhoc network with my PC, but not yet tried to
go into the main network router, but I think that works too.
RN-XVee operates much faster than XBee, but I don't think it's usable for
transmitting video, either. One problem withRN- XVee is you may have longer
response latencies when going into the wifi network than with using XBee.