Getting Task Actor via API REST (BOS 6.X)

Hi there again!

Guys, i really need some info related to the tasks and the users that can actually perform them. I really don't know where to start, maybe i'm missing a lot of things. I googled a little and looked in this forum with no luck, if any of you have any tutorial or some resource about how to deal with bonita users, that'll be awesome!

I have a simple process with 1 task and 1 Actors group (if i can call them like that). I've assigned the task to that specific actor group.