Can we just send the video over wireless/wi-fi?
No. It is now widely accepted that wi-fi is unacceptable for most video applications, although they are fine for simple computer networking. Trying to send MPEG-4 (even simple and advanced profiles such as DivX and xVid) is extremely difficult and unreliable. Newer technologies such as WiMax have yet to prove stable enough in a commercial setting even for PC connectivity.