Pinbox Photo Vault
Hide Photos and Videos
Screenshots

Hunter's comment
Whenever someone takes your phone they check your gallery first. So if you want to hide photos and videos from your gallery then this app can help you with this matter.
Link
https://play.google.com/store/apps/details?id=com.pinbox.android

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Yes you are right if you give yours to someone. He/she will check your gallery first. I also do this.