your can buy cheap wireless videos camera with it's receiver from lajpat rai market or karol bagh and it will not cost you more then 1k but u have to do some bargaining. you can use it with a tv tuner card to record videos . i never used one of those so i don't know about the night visibility and battery backup but the video quality of those cams are not bad for a wireless cam under 1k i think this will help u.