You'll need to hide each individual photo/video, but you can't do so while dealing with a large number of files at once. Although it might take quite some time if you're hiding many photos or videos. Follow these steps:
Step 1: Launch the Photos app.
Step 2: Select Albums or Camera Roll
Step 3: Tap and hold on any of your own photos/videos you want to hide. (Alternatively, you can simply tap lightly first, and when the image appears on the screen)
Step 4: A menu will pop up asking you to Copy or Hide. Tap on Hide.
Step 5: Another notification appears, simply tap on Hide Photos.
It will no longer be visible in Camera Roll, Collections, Moments, and years. However, you can easily access it if you wish. You can even share or send it via message by:
Going to Photos > Albums > Scroll down and select the Hidden folder. To unhide, tap on the image and select Unhidden.
So we've shown you how to hide your photos or videos on iOS 8 without using any third-party apps. Also, download river crossing and Chinese chess games to play in your free time.
https://Mytour.vn/ios-8-hide-photos-on-photo-app-1394n.aspx