How to record iPhone audio with camera footage?

If I wanted to record a conversation with someone through my iPhone headphones then how would I link that to a separate camera? I'm really new to this stuff?

There are not easy ways, but only complicated ways.
1. If your camera had microphone input that looks like a headphone jack input and a separate headphone output, you can try connecting your phone with an aux cable which would be connected from your mobile headphone out to your camera microphone input. The problem here is that if your camera can't make you listen to live microphone input from you camera headphone output, then you won't be able to hear the person's talking.

2. Put your mobile on loudspeaker and keep it near the camera and talk. Problem here is that everybody will listen incase you wanted to keep the conversation private.

3. If you own a android mobile there are voice recording apps, you can record your conversations on the phone while you're recording video from your separate camera. Then you will have to merge them in PC using any movie editing apps. The problem here is either lack of skills or you don't have the software or sometimes a problem with android voice recorder [which is sometimes it doesn't record the conversation properly].

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