The Art of Conducting - Great Conductors of the Past
https://www.youtube.com/watch?v=LYnqU4AJvtA&t=50s
20世紀の名演奏 ⑥ 永遠のカリスマ ~激動の世紀を生きた大指揮者たち~
https://www.youtube.com/watch?v=-EeImihweN0
Conductors and conducting
https://www.youtube.com/watch?v=VPSqRqcB6I4
In this 1993 documentary, conductors and other musicians discuss the art of conducting.