Videos transcription business to earn money by internet

Having a website with videos only has the problem that most good video hardly can be grasped by search engines to treat of a code of insertion of video that doesn't say much (clear unless it's a viral video that sometimes have thousands or millions of visits by experts not yet very clear factors).
Happens that in the video I can speak for 3 or more minutes but nothing of what I say is possible to be grasped by search engines and hence the importance that the content of the video is transcribed to enhance the optimization to be found in search engines like Google (in what is known as SEO - Search Engine Optimization).
Today to transcribe a video has become a somewhat easier task with the programs of speech recognition as the Dragon Natural Speaking I said in the past but which can transcribe the programme still needs to be corrected and polished to give it a final finish. Just here may arise an opportunity to develop a profitable business idea to earn money.
The service to sell would be precisely to transcribe these videos so that the client can use these transcripts to increase exposure on the internet to improve your SEO for search engines. Also of course transcripts can be used to improve the learning materials. This trnascripción work could be done much faster used voice recognition programmes existing in the market.
An idea similar to that question is that for example has developed the website Text Speaker charged U.S.$ 2.00 USD per minute of video to transcribe. Now service is given only for videos in the English language.
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You can visit the SpeakerText website by clicking here on this link