Is article spinning and article marketing has its place in video marketing after Google Updates?
Do not do any spinning it might get some traffic and ranking but it's not long term.
Which is the best Keyword research tool to buy?
My favorite keyword tool is Google Keyword Adwords Tool. It's free and gives you plenty of great ideas to go after. I also use the google search field for ideas by typing "how to [Keyword]" and seeing the suggested results.
Is services like traffic kaboom is worth buying?
Never heard of Kaboom, however if they can create real unique articles that will help your users and they don't spin content it might be worth it.
Is buying youtube views is effective?
It all depends on who you target. This would help with marketing the actual video but has very little to do with seo.