From last few days I was trying shoot video on iPhone and wanted to use Bluetooth mic instead of iPhone's built in mic. When I connected Bluetooth with iPhone and shoot a video I found that, iPhone didn't record my voice through bluetooth but instead it recorded through built in mic. So I did some research and found a way to to accomplish this.
Using "Capture" :
After few days of research I found an app called "Capture" on App Store. This app allows you to record voice through Bluetooth while shooting video on iPhone.
Once you connect your Bluetooth to iPhone just open this app and click on record button, this app will use Bluetooth microphone instead of built in microphone.This app will also allow you to record only voice. So you can make audio with video or only audio. I found this app very useful for the people who wants to use their iPhone to shoot tutorials, educational videos and many more. Advantage of using Bluetooth microphone over built in microphone is that it will avoid noises and will improve audio quality. Give it a try.
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