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I have "Hide My Folder" on my iPad. I think it is still free atm for a limited time as it is usually $4.99.
 
I use an app called PhotoSafe, allows you to add/remove pics/videos from within the device but also from a web browser over wifi. Many features such as double tap and it hides what's on screen at that time but also dual passwords so that one is your "real" hidden photos and the other password for a fake hidden photo library.
 
Any more suggestions? I know some people have pics and videos they don't want easily to be easily accessible.
 
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