Don't worry I also suck at doing videos although I have given it a shot. I do mainly all my promotions through content marketing and it is working well on my affiliate sites, although maybe not as effective in promoting WA.

Hi Lynne, I don't recall seeing any corporate WA promo videos to be honest, only ones done by other members for their own promotions and there're plenty of them about on YT.
Some are very professional looking and would be difficult to compete against so for now I'd suggest you stick with what you're comfortable with if it's not video marketing.
Mark

Hello Lynne,
Please find attached video produced by Pastor Dre, a Wealthy Affiliate member.
He has produced a couple more of these video's.
Type his name in the need help bar and you will find them.

Regards Shane, Free Wealthy Affiliate Promotion Video

you could also just go into Youtube and search WA review, and you'll find a lot of good ones there.

The only downside though is many if not all these videos at one point or another will tell the viewer to sign up through their website instead of yours.

But it's something you can try until you feel comfortable making your own. :)

I don't think there is any promotional video as far as I am aware.
However, you can utilise some of the training videos within the post - you would just need to screenshot the video image and then link it to the page.

Maybe someone else can suggest a better way.

Good luck.