Not sure why is this even a topic in here. Anyone who has a functioning brain knows that the answer to this question is "Yes." Playing poker is a gambling activity for you are risking your money in hopes that you'll win and the money would return with profit.
OP's asking if it's still a gambling activity if it's in a tournament. Of course, no matter what type of round that is, as long as you risk money, poker is still a gambling activity.
Do you think that it is considered all across the world as gambling?
Why wouldn't it be considered as gambling on the other part of the world? The same thing applies to any part of the world. Poker is gambling.