My iPhone 4S won't let me take video?

So I have had my 4S since Christmas, and it allowed me take to like 130 pictures and videos with a storage of 5 GB. Now, I have deleted pics and videos all the way until I had 22. I bought 15 GB of storage and 10 GB is available but it STILL won't let me take pictures and videos. I want to reset my phone but will it delete all my apps, notes, pictures, and videos?

If there's a problem and you want to do a factory reset. Go to itunes and back up all your apps and files. Then factory reset on the phone, reboot, and check the camera and see if there's a problem or not. If there's none, plug phone back to itunes and back up all the apps and files and contacts. If problem still arises, take to apple store or find if other people are having the same problem online.

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