I'm not alone on an island (speaking as a professional, not a DIY) when I say the answer to any Dreamweaver question is: Don't use Dreamweaver.
The main reasons involve clunkiness and ancient means of accomplishing the simplest of tasks, i.e. Adobe still hasn't updated the Javascript code since they took over from Macromedia as evidenced by variables and functions atarting with "MM" - more to the point these days developers use jQuery and VideoJS and HTML5 to accomplish more with less. This, of course, is a broad statement and my opinion. That being said, if you encounter some negativity in responses here in the forum, don't be too surprised.
As to "publish local for sub sites and link them together" - please supply an example and better description, publishing is not normally done to "local", i.e. your sandbox on your computer running a LAMP setup for local development. Usually it's published to a remote site FROM your local. Subsites could mean a lot of different things (multisite format where different sites share docroot, name based virtual hosted sites, or simply a site at x.yourdomain.com and y.yourdomain.com each with unique docroot, etc.)
If you have templates in your Dreamweaver oriented web site(s) than remember that is proprietary so it's okay to export to a remote host, but you're married to Dreamweaver for future edits if you want to maintain automatic link correction between pages, etc., using that template system.
As to video, I am an advocate of coding my own solutions using
VideoJS which is an HTML5 JS solution that uses the video tag but is the most cross-browser solution I've seen. It also has easy to use API for developers who like to customize, easy to style, loads fast and handles multiple formats with options to degrade seamlessly if a video format is not supported on the client.
In short, I would not rely on any widgets in Dreamweaver and of course stay away from Flash/Shockwave plugins/extensions to it these days as a primary solution (okay as a fallback in the client browser which VideoJS supports).