You can take a look at the video @beanz recently posted over here . . .

https://steemit.com/podcast/@beanz/voices-of-the-underground-podcast-trading-special

. . and @hilarski have gifted the community with several sample intros/outros that you can pick up for free if you just follow the link below.

https://steemit.com/steemit/@hilarski/three-steemit-intro-videos-that-can-be-used-for-your-content

Here are also a few by @piedpiper that I think he has made free to use.

https://steemit.com/steem-marketing/@piedpiper/steem-waves-animated-logo-reveal

https://steemit.com/steem-marketing/@piedpiper/steem-tech-animated-steemit-logo

https://steemit.com/steem-marketing/@piedpiper/animated-steem-logo-steemfall