This app is camera app which shows preview after some seconds(configurable, up to 10 sec).
You can use this for practice for sports, like golf, baseball.
Example, for golf,
1. Set delayed time to 10 seconds.
2. Put iOS device in front of you.
3. After driving a golf ball, you can check your drive easily.
4. Also you can draw line, such as swing plane and so on.