(Photo Credit: San Francisco Opera) On November 1, at 8 p.m. (PDT), the new film, “Eun Sun Kim: A Journey Into Lohengrin,” was broadcast for the first time, although being available for viewing already. Featuring the Korean conductor Eun Sun Kim and her labors around the preparation of San Francisco Opera’s 2023 production of Wagner’s “Lohengrin,” the behind-the-scenes film is but one in a growing trend of operatic films designed to show the background of staged operatic marvels.