Jack Black, the star of Paramount Pictures’ “Nacho Libre,” will take audiences behind the scenes with exclusive “confessionals” about what it was like to make the upcoming comedy film in a series of video podcasts debuting on the iTunes Music Store and QuickTime.com. Beginning March 15 and continuing for 10 weeks, leading up to the release of the film, new podcasts will appear every Tuesday and Thursday, downloadable free of charge for the video iPod and at QuickTime.com. The film opens in theaters nationwide on June 2.