Video SEO to rank on Google

Can you really produce a vid, post it to your YT channel - optimize it and have it rank on the top of the organic search in Google.

I read a service on here saying they can do that but I'm wondering how legit they are due to comments like "we tweaking the system and will be down for a bit - please be patient"

Is this process REALLY possible?

Can I buy this service out there?

Thanks for your reply's/comments in advance.