https://blog.wongcw.com/2019/09/14/premiere-pro%e8%bf%8e%e4%be%86auto-reframe%e5%8a%9f%e8%83%bd%ef%bc%9a%e8%bc%95%e9%ac%86%e8%bc%b8%e5%87%ba%e7%a4%be%e4%ba%a4%e5%aa%92%e9%ab%94%e7%9a%84%e5%b0%88%e5%b1%ac%e8%a6%96%e9%a0%bb%e6%a0%bc/