@OP:
if you have a DVD player that has component outputs (almost all of the cheapies do these days), you can then get a component to hd15 cable (vga type connector)
your monitor needs to be good enough to sync to broadcast timings instead of vesa standard timings. most of your CRT monitors will be able to handle this, but it will be hit and miss when it comes to lcd's
if you have a monitor, and a computer, why not play the dvd on the computer, and connect the computer to the monitor?