HI Guys I want to make a robotic vehicle which links to a PC through Wifi. The vehicle is having a web cam and it can be operated in manual?

You can hack a router and use it to help control the vehicle through your Wifi connection. Because the vehicle will require a good size battery, you will have to have a larger size model car. In most remote control cars there are Realtek RX2/TX2 chips or similar chips with pin compatibility for a microcontroller connection.

The microcontroller options and serial connections are further discussed in the reference below. Steering circuits, software and webcam considerations are also discussed.

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