This is very interesting to me as a marketing tool for video.

A long time ago, I was taught the importance of AIDA in marketing. Attention, Interest, Desire, Action. Which I always use to judge the quality of the Title and Meta Description of web pages. Be they Hive posts or any other web content. Where the title must grab attention. Then the 3 sentences of the description attract Interest, create Desire, and promote Action. Such as, "read now to save a fortune" or whatever it takes to get a click from search results.

Recently, I realised that it's also important to start your article with something similar. In which case, the title is usually the same. But the interest and desire sentences are not restricted to a share of 160 characters. Also, the action sentence is usually something like, "read on to learn the secret of instant success. Or just click here to get it now."

So your 20 - 30 seconds intro is very similar to the opening paragraph of a web page. AIDA in as few words as you can manage. To avoid viewers leaving without watching to the end.

!BBH