How to play Videos from my iPhone to my aftermarket Car Stereo?

I just recently installed an aftermarket stereo on my vehicle & It has built in iPod/iPhone Audio & Video Connection according to the box… It also has a built in sync cable and aux cable… But I can't seem to play videos from my IOS 6.1.2 iPhone 4S to the stereo… I'm asking for help if maybe I need to download a certain App from the app store or tweak from Cydia… I will appreciate the help… Please & Thank you.

What brand and model number is "an aftermarket stereo"?

Some simply aren't compatible with all iPhone models and/or operating systems.

You need a second cable with video output, plug this in the back of the radio, av1 or av2

http://www.oemautosound.com/pc-352-84-ipod-aux-input-docking-to-rca-video-charging-cable.aspx

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