Wifi cameras as I know they are connected just to power and transmitting directly to your
computer software or phone if available, you don't need a board that will control the video feed.
About creating a UGV more like a car you can work with a Arduino Uno and H-Bridge to control
the motors direction a L293N will do the job, for radio control the most used here and available
free code is nRF24L01 the small pcb antenna or the Power Amplified ones with the 2db antenna.
You will need ofc 2 arduinos one for the car and one for you to control the car, or if you are experienced
in electronics & pcb you can build your own PCB's and use one arduino just to program the chips.
Would be nice if you can tell us your age and what is this project for.
I provided you with plenty of info to start with something, would be nice as well to give us the
model of your available wifi camera u are using or you are just thinking to buy a wifi camera?
If you think to buy one that's not a good idea there is better options for cameras.
If you just want to record the video just put a camera if you want to have a live video feed then
my suggestion is to get a FPV.
Your welcome.
D.60