You’ll need a VHS recorder with composite, s-video or component inputs. You’ll need a dvd player that outputs through one of those types of lines hooked up to the VHS recorder.
They also make combo dvd player-VHS recorders that can do this type of thing without going through the lines.
The main problem with this procedure is the anti-copy protection added to dvds. There are devices that get rid of the Macrovision copy protection, but that is an added expense. What I would do would be to make a copy on your computer (thereby getting rid of the copy protection), burn to a disk, then transfer to VHS. You will have to have a dvd burner in the computer and some blank dvds of course.
Break encryption on the dvds and rip to the hard drive using DVDFab HD Decrypter. If you are going to single layer dvds, you might have to compress the movie to fit onto the disk, so use DVDShrink for this process. Burn to the disk using ImgBurn.
www.mrbass.org (for DVDShrink and guides to using it)
DVDShrink can break encryption and shrink all in one operation if the dvd only has simple CSS encryption. So you might try it first. DVDFab is there for newer movies that are more complicated to rip.
This is the guide for burning with ImgBurn to a single layer dvd from dvd-video files: http://forum.imgburn.com/index.php?showtopic=4632
All three programs I’ve mentioned are free to download and use. If you need a bit more help, don’t hesitate to ask.