Private photo vault app keeps your photos and videos safe under the password. You can also set Decoy password also. Download this amazing app from here..
Google Play Store - https://play.google.com/store/apps/details?id=potenza.photo.vaultPaid&hl=en
For iOs - https://itunes.apple.com/us/app/private-photo-vault-app-password/id1089920041?ls=1&mt=8