Welcome to the world of the Pranks.
Vitaly was almost beaten to death.
He was once(several times later on) busted for pranking people.
And he was interviewed on several local news channels.
Do you really think this all happened for hiring actors? I don't think so.
Prolly few of his videos might have some repeat faces, may be skeptics like you think he hires people or may be just a co-incidence.
But having gone through most of his videos, they're spontaneous and legit.