A matter of being able to save the files to a media, due to the size of them, that may be a problem. And reliability of the hardware, older computer, and if it goes to sleep, etc when it shouldn't are considerations.
Some warehouse stores sell a kit with 2/4 weather resistant cameras that could work with a DVR and television, and also record to a DVD-R or even a VHS tape. Being able to control when the device is recording, compared to whenever the problems occur, could be a trying time.
You could set up a few dummy cameras after you are set to record the idiots on parade out your window with a iSight or other camera, or a hand-held digital camera with video clip mode, then catch him/her playing pinota camera whacking, too.
A camera covering the camera's location is usually a thing that captures their attention least. Especially if that one does not look like a camera and its presence goes undetected. Do you have a home security system with live monitoring, for those hours you are gone, should things escalate?
Good luck & happy computing! 🙂