How can I make an animation start when I get to a certain point?

so i want to make a game where when you first start the game,a video plays where you have to watch it and cant move then after the video you play and when you get to a certain point,another video playes or a normal animation plays,like a GTA game,but i don’t know how to do this? can anyone please help me?

yes yes,i dont know what that means but i think yes a particular coordinate