where can i download a environments like this video??
he was say in description: I did NOT create the actual art assets used in this video, they were created entirely by Epic Games.
The person is talking about the ASSETS used in the video. These are the items such as the rocks and cars. You can find them on the Epic Games Launcher Marketplace! 
i search for they but i wasn’t find it can you give me it if you know that?? i need just the material that was in landscape (( sand )) cause it has rock when drop it down !
any way i thank you for tell me this thing i was found some environments in marketplace !!
No idea mate! But have a dig around and you’ll find some similar assets.