The present perfect is usually used for one or more of these reasons:
Life Experience - "I've never been in a movie before."
Change in Situation - "Now I'm famous because I've been in a movie."
Up to Now - "I haven't been in a movie yet this year."
Lots more examples of these uses:
Your example is used for Life Experience, and it doesn't matter whether the person is in a movie now. It only discusses the person's entire history up to the present.