Fancybox problem, video embeed from vk.com

Hello! I have a site with wordpress platform and with “boxoffice” theme. My site is here.
My question is why when I get on a movie is an effect on the cover that you open (basic from the theme) that the film’s trailer on youtube in a fancybox. I’d like to open a fancybox from vk.com video (to embeed it).
In metabox the category of movies, just have to enter the youtube link, NOT the embed code.
If you can help me with a solution… Thank you in advance and sorry for my bad english!