Surveillance Camera that can work with a laptop


Is there any way to setup a 2X night vision camera setup by using a laptop as a DVR ?
I want those cameras to run directly by using the laptop's USB power, so that there will be no need for a UPS/invertor.
If I use a WiFi Camera like this, is it going to work ?
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any other ideas ?

I am not planning to use a DVR , as I will have to add a backup power system to it as well. using a laptop as DVR+power will be easy to maintain.
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