If the jacks are "output" they won't be connected to the DVD player. They may be there for an external speaker. If there are only two, red and white, they are for audio left, right and don't carry the video signal.
If the jacks are "input" to the TV. the DVD player would have two interconnect wires left, right going to those jacks. Again, probably audio only.
You should look on the back of your TV to see that wires are already connected from the DVD to the TV. You probably have to select "External source" through the TV's "Menu" selections to see the video from the DVD player.