How to film a video on iPhone?

My iPhone is no longer giving me the option to slide left or right in order to change the video settings to 'video'. The only options I get are time-lapse, photo, square and pano?

Various possibilities, see the link. Have you got another app that uses video already open?

That's weird. Never heard an iPhone do that. Don't think that mode can be added as a restriction but no harm in checking if that is the case. May end up requiring a restore of the OS though.

Restart the iPhone by holding the power button and the home button. After the phone turns off, let go of the power button and keep holding the home button. After that, check again if you can slide left or right.