If you successfully submitted your videos through the Media Uploader and one or a number of them are still listed as private:
The video(s) in question may still need to be processed if it is within the 3-5 business day processing window. Your video file may have failed to upload. Please check the Media Uploader for failed/corrupted media files and re-submit if the file is listed as unavailable. The video(s) may be going through a content check per our content guidelines and/or branding rules.