Learn to code! Learn to develop! It's fun and challanging! Don't just depend, watching, and request... Then you will know why we talk like this.
It was developed by Samsung's developer, not community. It uses proprietary algorithm that developed by Samsung. I don't say it's impossible. We can try to use OpenCV for the open source algorithm that can do face detection. But, use logic! Why do something that eats much brain and the outcome isn't too important.
If you distatisfied with your phone, develop it! Want simple? Replace it!

Read this, Sir! It's important for you: Catb.org

If you don't want to get stupid comments, don't ask a stupid question. Remember! The more we study, the more we discover our ignorance.