Once you produce your video from Camtasia and try to upload it to Vimeo you may get the following message.
This is indeed just a warning. This does not mean your video will be blurry. In most cases you can safely ignore this message, continue with the upload and end up with a high quality video. If you play the MP4 created by Camtasia and it looks clear on your machine, then it will look clear on Vimeo. However, make sure that you click the HD button when viewing on Vimeo for the best quality. See below.