Rest assured, your child will learn to read when he is ready. Sit down and read with him. Quality time spent with you will be far more valuable than anything he gets from a DVD.
Look into some of the Hooked on Phonics programs. Some kids really get phonics and it helps them learn to read. Our library carries a lot of these, so you could try them for free if your library has them, too.
Teach him the alphabet if he doesn't already know it. Teach him to write the letters and to write his name. The reading will come in good time. :)