One of the easiest automatic transcription tools that you could use is YouTube.
Just upload your video on YouTube and it will transcribe your text.
This is a long-time feature of YouTube’s video upload system.
How long will this take?
The close captioning system can kick in anywhere from half an hour after you upload to several hours—it’s kind of random.
Also, if you’re looking for specific languages, the auto-translation system on YouTube can be kind of spotty.
Still, you should consider YouTube’s auto-transcription because it’s 100% free.
There's a DOWNSIDE though...
Youtube doesn't include punctuation
Sentence construction can be a bitch too.
If your video has crappy audio, it would probably be better to transcribe your stuff by hand