Sometimes it's a good idea to add subtitles to your video, because someone might not be able to understand your voice, but you would still want them to fully enjoy and understand the video. You can add subtitles or captions in Camtasia 7 pretty easily, if you know how. If you don't know how, this video will "spell" out the steps for you. If you want clearcut answers to the word riddle of videos, this is the it.
For more information, visit the 4blogger post.