The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
This is a funny app. Let's turn iphone's camera on, and detect the Vietnam national flag. When iphone see Vietnam national flag, a fun emotion waves the winner flag, and it plays the Vietnam national anthem.