following for actor

Good afternoon Here’s an idea: Niagara VFX moves along the path when the player comes within a certain distance from the Niagara actor. Witcher example (11:13):Чур укажет путь! (Ведьмак 3 Дикая Охота - ep.7) - YouTube


I found only tutorials with time travel, but I did not find any interaction with the character. Any ideas? Maybe tutorials?