If you loaded your script with yepnope you should be able to use it in the init function. See my tutorial on edgehero.com.
If this is a free service I can try an make a sample for you.
Yes. Did it help?
Afraid not. I get an error in console saying 'TypeError: Wistia.playlist is not a function'.
I used yepnope and not getScript. Might try that next.
UPDATE: Tried using getScript but received the same TypeError.
UPDATE: Finally got it to work! Turns it I simply didn't reference the proper API on Wistia's server. Switched it out and videos work. Updated file in Dropbox. https://www.dropbox.com/s/dzxfvd0n7ppqnk7/playlist.zip