Ninja Masker is simple app to overlay mask image (such as ninja mask) on faces detected in camera image. Using this app, you can easily suspect persons on street, or TV shows, as ninjas. Also you can use this app to protect privacy of people in photo.
-Realtime preview
-Capture overlaid image
-Overlay mask images on photos in your camera roll
-Can add custom mask images from your camera roll

*This app consumes much processor power. iPhone 5s or later recommended.