You need something like the BELKIN DVD Creator USB 2.0 link below gives details, software required comes with it. While this is an Australian site such devices would be available in your local stores or online.http://www.dse.com.au/cgi-bin/dse.storefront/4aa1fb8c01394958273fc0a87e010681/Product/View/XH6271
Depending on your needs you can also get capture devices as part of a tv tuner, in usb or pci/pcie cards also with software included and about the same price or more depending on brand and features, like dual tv tuners and fm radio.
You simply take the output from the vcr's audio & video using standard rca leads, record using the supplied software, playtime = record time, no short cuts.
The tv cards usually come with adptors for standard rca connections.