A good on demand site for free videos of full matches of Copa America:
http://www.fullmatchesandshows.com/
http://www.fullmatchesandshows.com/copa-america/
Archive of previous matches in tournament from the last couple of weeks:
http://www.fullmatchesandshows.com/2015/06/
http://www.fullmatchesandshows.com/2015/06/page/2/
Also this site has full matches on demand for free:
http://livefootballvideo.com/fullmatch
And this one:
http://www.matchhighlight.com/category/full-matche...
The matches don't seem to be streaming live for free on the official You Tube channel this year.
Highlights only on the official You Tube channel:
https://www.youtube.com/user/CopaAmerica/videos