i would recommend that you use hot video squeeze template.

or else just use a simple lead capturing form such as big headlines,put a picture which is thumbnail of your video to tease them and a simple call to action by asking their first name and email address.

the more you keep it simple the higher it converts.and believe me people naturally are curious.so if you put a thumbnail of your video they would be curious to see what's your video is about.most of the people would subscribe to your list because they really want get out of their curiosity.

this is a well known tecnhique used by big marketers such as Ryan Deiss and i'm seeing more and more people implementing this strategy.