Hi , can someone tell me if this strange tapping is something normal in this engine ? If not what can it be ?
https://youtu.be/bs_WHthZhlM

 

that sounds like the direct fuel injectors. Most cars with direct fuel injection make that sound. The car also has port injection.

 

Completely normal. Direct injection engines tend to have a ticking or tapping sound at idle. Drive any modern Kia/Hyundai or Honda, and you will experience the same thing. The IS 350 and 500 also exhibit similar characteristics.