Custom Maps in GtaV?

How to create such custom maps as the Youtuber linked in his video below. For example, where one can spawn a crowd and they do not move. The editor does not think so. (I play on PS4)

This is only on the PC, these are mods

Yes, this is only on the PC, these are certain Modmens prohibited by Rockstar. The advantage of the PC over every PS.