It's not as simple as plugging in headphones, you would need a female RCA to male 3.5mm headphone jack adapter and a female-female 3.5mm coupler, and you would plug the red and white cables coming from the Xbox to the adapter, and plug the coupler into the other end of the adapter, then plug the headphones into the other end of the coupler, but I don't actually know if this will work since the adapter wouldn't amplify the sound and the Xbox might not output with enough volume for the headphones. Also, the cable wouldn't be very long so you would have to sit close to the TV.
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