The tricky part for the OCR in this example is the diverse background, as the Chinese characters are directly inside the movie.
Your comment is interesting, as the original motivation for creating the Copyfish extension was to help me watch Chinese movies. So I can confirm that for this purpose, it works fine. Of course, once in a while it gets some characters wrong but it works ok with many movies.
Here is a screencast of Copyfish doing subtitle OCR:
