After studying 12 years of Chinese literature, I have obtained enough experience and knowledge to read/write both traditional and simplified characters, and analyze literature etc. I am able to understand two dialects of Chinese, Cantonese and Mandarin, the two major dialects used in China. I can add captions to the film.
I have some experience with this kind of translation, once from a school project from a film course in which my job was to caption a Chinese sitcom in English. Another example would be an application letter that one of my friends sent to a part time job, which I wrote in English, as he lacked experience in writing formally in English.
I would also prefer to do the editing on Adobe Premiere Pro, which I believe is easier to add captions to. However, I am flexible and will be willing to do it in different ways.
Wish you success on the video!