4K support

Hi,
new to Kodi and 4K.. got a samsung 4k TV connected to a htpc (intel N3150) running kodi 17 and when i play a 3840×2160 movie i get pretty big black bars on the top and bottom. is this behavior “normal?”

the movie is a trailer/sample of Deadpool which shows 2160p,UHD 4K,DTS-HDMA 7.1 DDR

also, does Kodi natively support 4k or do i need to install additional addons?

thanks.