Problem......
If some one is going to tamper around with your car, then they are going to that at night. Most webcams only work during the day as they have no night vision. And what webcams that do have night vision are rather weak.
And webcams are only going to be good for seeing things up close. About the only people that I have seen using webcams for CCTV have been
1. Service clerks as change booths. Now ever the camera (and clerk) is normally behind bullet proof glass.
2. People that want to monitor thier flat/house mates when they want to keep them out of thier personal stuff.
Both instances are only good for upclose applications.
How about pick up the following
USB Digital Video Recorder/Camera Adapter from OzSpy Security Solutions
12v 300mA Regulated power supply from OzSpy Security Solutions
20m RCA Video, BNC Audio and Power Extension Cable from OzSpy Security Solutions
Colour Outdoor IR Camera from OzSpy Security Solutions
and do the job properly as appose to messing around with a webcam.
Now if you are in the USA or have access to eBay, I am sure you can find some thing cheaper than that I offered up there.
but the problem is in manual exposure setting when the day comes its all white
if i use auto exposure its too dark at night
is there a way to modify it a lil to make it overexpose at night and normal during the day?
That is all dependant on the camera. If you get a good quality CCTV camera with IR Night Vision and position it properly, you will avoid those problems. Bar in mind, that night vision on most entry level cameras will give you at best 5 meters range. You can get some larger cameras that brighten up larger areas. However they do cost money and you will be needing a larger AC Adaptor.
The to avoid the white out during the day, have the camera facing downwards and not pointed directly at any light source. Otherwise, depending on what your lighting is like in your car park, you could look at purchaseing
High Resolution, Low Lux Colour CCD Camera from OzSpy Security Solutions
along with
12-30mm CS vari focal auto iris DC lens from OzSpy Security Solutions
Make sure that the lens has an auto iris so that it can change lighting in the footage depending on the avalable day light.
Atleast there you can mount your camera in your appartment and zoom in on the location which you want ot monitor.
Seriously, for what you are after, you are going to need some thing better than just a simple logitech webcam. If you are on a budget, then I would suggest eBay
Also, check with your local police or who ever in regards to what need to be done in be CCTV monitoring your area.