Last month TED announced that translation and subtitling of their videos into 40 languages is underway. At that time the subtitles only worked if you were watching a video on the TED website itself. As of today the subtitles now work on embedded players too. This should make sites like Teaching With TED more accessible to students with hearing impairments as well as ESL/ ELL students.
Here is a related resource that may be of interest to you:
Two Good Options for Subtitling Videos