Huawei P9 Lite - Manual (Page 109)

Camera and Gallery
102
Object tracking
Use object tracking when taking photos of moving subjects, such as people or animals.
The camera will automatically focus on the moving subject to ensure that your image
stays in focus.
Object tracking mode and smile capture cannot be used at the same time.
1
Open Camera. Swipe left on the screen to access the camera settings.
2
Turn on the Object tracking switch.
3 Touch the subject on the screen. Your camera will remain focused on the subject.
4 Touch .