How to do zoom in iphone 5's camera Without any other app?

I want to do zoom just with the ordinary camera( i don't want to install any app) tell me the buttons Can we do it or not? Please tell

If you are talking for photos, then just pinch to zoom. That's it.
If you are talking for videos, unfortunately it doesn't. You'd need an app.

Just pull your fingers across the screen starting in the middle of the bottom of the screen ad pulling out. A zoom thing should pop up

If you are talking about videos so that is only possible with the help of Applications. But on other side if you are looking for Pictures that is so simple to do.