How did they do it?

(Hi

I found myself by youtube a server of minecraft altis life, where they had these features:

I was wondering if you could help me figure out how they could do this and what possible ways they used. I would like to try to create a similar server in my country. Greetings and thanks in advance.

PD: I'm using translator.

( Custom Item )

( when you press the M for view the minimap you can select the path to the next point )

( minimap when you are playing )

(UI modified with slots to backpack, gps, phone and identity license)

 (UI NPC jobs when you clicked on them)

(How can I make these textures so well defined?)