Can you put a passcode on your photos app after the IOS8 update on the iPhone?

I saw on twitter you could put a passcode on the photo/message app. If this is true can someone please tell me how to do it?

No. Third party app developers can put touch ID passowords on their apps and so can apple but apple has not made that a feature on ios8 for the photos app. If you are on ios7 still you can jailbreak your phone and download an app that will allow you to protect your photos app but currently there's no way on ios8.