Your question is not so clear as it could be, but google do rank videos and good title will help you be found easier.

Yes, meta data is still important but you have to use different meta data for different pages.

Your question is not clear, do you mean how to rank youtube videos or what?

if you're asking about ranking videos of course title tag, meta and keywords are very important. you should optimize your video content and titles just as you're optimizing content on your websites