photo-demo contains the most pertinent files.

src -> main -> java -> photo for java classes

src -> main -> res for additional files and media

The main camera activity https://github.com/ryan9lim/PhotoOpt/blob/master/photo-demo/src/main/java/com/google/android/gms/samples/vision/face/photo/CameraActivity.java

The photo demo activity https://github.com/ryan9lim/PhotoOpt/blob/master/photo-demo/src/main/java/com/google/android/gms/samples/vision/face/photo/DemoActivity.java

Logo https://github.com/ryan9lim/PhotoOpt/blob/master/photo-demo/src/main/res/mipmap-xxxhdpi/ic_launcher.png