I'm not here to judge you about what you do with the camera on your iPhone, as that's none of my business, but if you have some photos and video saved that you don't want the world to see then you may want to try the Keep Safe photo vault app.
Keep Safe photo vault is simple, straightforward, and works exactly how it should. Launch the program, create a four-digit password, add your email account, and the secure album is created. Move any photo or video to Keep Safe and it becomes password-protected. However, keep in mind the app just copies it, so you will have to go back to your photo albums and delete the original.
That's really a minor setup issue, and once that is done, using Keep Safe becomes almost second nature. If you're taking a photo you don't want the world to see, launch Keep Safe instead of your camera. For photos you don't have to log in, you can snap away with the camera button just below the keypad. Those photos go into the Keep Safe photo vault app and not into your library.
As far as video, well you can't shoot video at all using the app even after logging in. But lets face it: if you're shooting video and you want it to be private, I'm sure you'll have the time to copy it into Keep Safe.
Keep Safe photo vault still allows you complete control of everything you import, and you can import as much or as little as you like. But it was the one additional security option that turned into cherry on top: Fake PIN.
Fake PIN allows you to create another folder, one filled with things you may want share with others. In other words, a decoy folder. This way if someone asks you what your PIN for Keep Safe is, you can provide them with the false PIN and they can see some of your "private" pictures and video.
If you need security of any kind, especially multiple levels of security, for your photos and video, then definitely download the Keep Safe photo vault app. Although you can't shoot video with the app, Keep Safe excels in every other way.