Sounds fake to me, this is not possible with the iPhone through default software and even with a jailbreak there is no way you could ever cram the video through the headphone jack, you would have to play it back through a very specialized app, that would need to compress it down to an unrecognizable mess and you still would have to figure out a way to push it to the screens. Not possible IMHO.
That looks to be because the jack is an AV jack, not just a simple headphone jack, where the connectors are arranged such that when you plug headphones into it they only make connection with the audio part but when you have the right cable (with a much longer connector with more segments) it would make connection with both audio and video out, but each have their own separate physical connectors.
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Sounds fake to me, this is not possible with the iPhone through default software and even with a jailbreak there is no way you could ever cram the video through the headphone jack, you would have to play it back through a very specialized app, that would need to compress it down to an unrecognizable mess and you still would have to figure out a way to push it to the screens. Not possible IMHO.
I know on the old iPod's with video out you could get an RCA cable that went from 3.5 mm to AV cables:
http://www.macworld.com/article/149335/2005/11/apple_ipod_av...
That looks to be because the jack is an AV jack, not just a simple headphone jack, where the connectors are arranged such that when you plug headphones into it they only make connection with the audio part but when you have the right cable (with a much longer connector with more segments) it would make connection with both audio and video out, but each have their own separate physical connectors.