You cannot connnect to DVD player but hypothetically, to a wireless transmitter/hub which is connected to an amplifier or AV receiver/compatible connected audio switching device. Your numbers cross into the commercial realm, so this forum won't help much.
I suggest asking at AVforums.com
I am looking to set up outdoor cinema with wireless headphones for around 50 people. Can you help me with:
1. Which projector and screen to choose?
2. How can I connect 50 wireless headphones to the DVD player?