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A safety note, only do this sort of mod to a TV set that has a full power transformer, for both the heaters and the B+. You don't want to do this with a "hot chassis" set.
As mentioned, audio is usually easy, inject it at the volume control. But be aware that sets using a quadrature FM detector (like a 6HZ6 dual control pentode) will need a higher amplitude audio signal than sets that used a ratio detector FM detector. You can identify such a set with a quadrature detector as one with the volume control directly feeding the audio output tube, without a triode driver stage.
Video may be harder to deal with. Video is sensitive to being inverted or not inverted. Audio doesn't care, but video does. Get it inverted and you'll have no sync, and if you do manage to recognize a picture, it will look like an old fashioned photo negative. Also the video from say a DVD player may not be high enough amplitude.
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