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This is a glaring bug in v26. Other threads about it:
https://forums.opera.com/topic/6632/problem-with-focus-in-opera-26
https://forums.opera.com/topic/6625/flash-videos-can-t-be-interacted-after-visiting-other-tabs
https://forums.opera.com/topic/6849/opera-problem-with-flash
https://forums.opera.com/topic/6791/annoying-bug-that-happens-when-changing-tab
The problem is fixed in Opera 27 and since Opera 26 is still in beta you can expect to run into bugs. I'd either use the latest stable release or try the dev channel release.
The stable release was updated to version 26 automatically:
I was having this problem with the beta and installed the stable version to avoid it, but it only worked until it was updated to 26, so now it's back.
It happens in videos but also in flash games.
I can't believe it slipped into the stable version. Not a good sign.