You can watch the trailer of the 2007 film based on the book and carrying the same name. The film is directed by Sean Penn, with a soundtrack by Eddie Vedder (Pearl Jam) and starring, Emile Hirsch, Vince Vaughn, Kristen Stewart, Catherine Keener.
It’s worth watching, although in my opinion it’s nowhere near as good as the book and struggles to convey the sense of McCandless’ journey as a spiritual quest. It also departs factually from the book at some points and focuses on other areas that are not central to the narrative, but that’s artistic license for you. Anyway, here’s the trailer courtesy of youtube: