Hmm - the only upside, is I don't want to be paid - just to do it for fun!
Do NOT say that over here----that is why pilots are not paid a decent wage in the US. You WILL lose the respect of EVERY working helicopter pilot on this side of the pond with that attitude.
Do a days work---demand pay.
And there is a long line of people who meet the above requirements ahead of you. Those that do this work have it sewn up pretty tight. To add--you also need to be working for a company that has an FAA approved motion picture manual and waiver.