Articulate Storyline 2 has several methods to implement closed captioning solutions.
These are two of the most popular methods found on Google:
Currently neither method is ADA Complaint, so it may appear to be similar to an approved ADA Complaint Closed Caption Track, but it is not.
To create the ADA Complaint Closed Caption Track we use Camtasia and insert the video into Articulate Storyline 2.
Inside Articulate Storyline 2 we use a custom made accessible video player.