What program to use to record motion from a webcam?

Question

Windows

In general, there is a usb webcam looking at the printer. In order to take into account the number of stolen sheets of paper.
And since the hard drive is not infinite, you only need to record movement. It's minimum.
One computer is weak. celeron 512 ram. TE would be nice to be able to process later. That is, let's say the computer records from 9 o'clock to 16 o'clock and then looks for movement all night, cuts them into files and saves them. It would be nice to have, although not required.
Basically, tell me something.

Answer 1

I don’t know if it will work, but have you tried ivideon?
Writes on the move, locally, from a webcam.
https://ru.ivideon.com/videonablyudenie-dlya-doma/
Memory is now inexpensive - you can buy at least a gigabyte on ebay.
(only there you need to look - there are strips that work only on AMD, they are cheaper)

Answer 2

Chinese webcam for 2k rubles. all this can be done autonomously.