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Video SEO is mostly a technical thing, assuming you already have video content. It offers absolutely great opportunities because it allows you to appear in the search result pages with a video snippet, which includes an image and therefore attracts far more attention and clicks then a "normal" search result.

What does your Video SEO plugin actually do? It goes through a series of steps, as soon as you update a post that you put a video in: It recognises the video and, depending on whether it's a self-hosted video or hosted on a site like Vimeo, determines what to do; If it's for instance hosted on Vimeo, it'll retrieve the video details from the Vimeo API; It'll determine which thumbnail to attach to the video and what the duration of the video is; It then saves all this metadata so that you get a video snippet in the snippet preview AND a video XML sitemap entry is generated for the post / page. It does all that on the fly, as soon as the plugin is activated you only have to add a video to a post and it'll automatically recognize it and go through those steps for you.

if you are serious about video production for your WordPress site and stand to profit from increased rankings and click-throughs, you should strongly consider purchasing Video SEO

In their last release, they enabled OpenGraph tags by default with no setting to disable it. Even when you already have WordPress SEO enabled and OpenGraph enabled in that. This is making people freak  out everywhere as double OpenGraph tags lead to problems with Google+ and with Facebook.

The best solution, honestly, is to install another plugin by Mark Jaquith, called Manual Control for Jetpack. This disables Jetpack automatic activation of new modules. Now you at least have to manually do something for stuff to break on your site when the Jetpack team decides to push new stuff.