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Not sure about a new iOS 6 feature that does this but what I do is the following.

Hold down the home button and the sleep/wake button at the same time and it takes a still image of what you are viewing.
 
It does it on the iPhne 5, I didnt see the feature on the iPhone 4, and didnt upadate my 4S to iOS 6 yet

so it may be an iPhone 5 feature only
 
Not sure about a new iOS 6 feature that does this but what I do is the following.

Hold down the home button and the sleep/wake button at the same time and it takes a still image of what you are viewing.

Won't that be in reduced quality though? In comparison to a standard picture taken.
 
On the iPhone 5 you can press the 'volume-up' button to take a photo while you're taking a video.
 
I would usually just watch the video back till is see what I'm looking for then screen shoot it.
 
When you are making a video there is a Photo button in the bottom left corner. Tap it and it will continue recording and will snap a picture. DON'T use the volume up button. It WILL snap a picture but will also stop the recording.
Cheers
 
When you are making a video there is a Photo button in the bottom left corner. Tap it and it will continue recording and will snap a picture. DON'T use the volume up button. It WILL snap a picture but will also stop the recording.
Cheers

I hope that gets changed in the future. I like using the volume up button my headphones as a remote to prevent camera shake.
 
You can only take still pictures while shooting a video on an iPhone 5.

The recordbutton has a camerabutton at the right that you can click.
 
Won't that be in reduced quality though? In comparison to a standard picture taken.

That's taking a screenshot so yeah it does reduce the quality down to the resolution of the phone's screen.

On the iPhone 5, there's another picture button that appears when you're in video recording mode that will let you take a picture without disrupting the video.
 
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