That's not Curitiba, there is no place that looks like that in Curitiba, afaik. Searching for it on Google Images, it's Seoul on the 2010 World Cup.
Also, there is no way a pro-government protest would get *that* many people here in Curitiba, it's probably one of the most anti-government capitals right now, for good and for bad. That, and I don't think even the pro-government protests had that many people
EDIT:
Here's a pic from Curitiba. Estimated 5 thousand people, it's more than I expected, all considered. The pro-impeachment one had estimated 200 thousand, which sounds like a lot. I wasn't in either of them, but I could hear some of the sunday's protests from my home.