popcorn-official/popcorn-app — pull request #554 by Shevraar (2014-05-18 16:42:52+00:00)
Title: NewFeat: Subtitle drag'n'drop while playing. (videojsplugins.js)

Now if you drop a subtitle track into the movie window while playing a movie it is instantly displayed.
As suggested by @sharkiller now this feature is implemented as a plugin rather than a modification in the player.js script.