If you have uploaded a video, but after few minutes still see the following picture, most likely something went wrong.
The main reason is a very low bitrate. Our backend does not accept videos with a bitrate (quality) less than 600 kbp/s. Please try to set bitrate to 700 kbp/s in your video authoring program and upload again. If you use Camtasia, here is a good tutorial that explain how you can configure it http://blogs.techsmith.com/tips-how-tos/choosing-and-encoding-mode-in-camtasia-studio-8/
Unless you sell access to a course or teach "private" course, we recommend using excellent Vimeo and YouTube services to upload your videos.