Thanks.
If the POV is the MC and told from first person - YES it would be a POV violation to tell the reader something the POV character doesn't know.
If the POV is full omniscient POV - NO, you won't violate POV if you tell use what happens during the blackouts. Full Omni is hard to do well though.
If the POV character(s) which may not be your MC, doesn't know it than generally speaking the reader can't know it without violating POV.
A 3rd person limited POV of the MC would probably lead to a POV violation. We can learn about what he did as others tell him or interact with him based on the events. If the POV is another character that sees the MC during the blackouts we can "see" it at the same time as the POV. If the non-MC POV learns about what happened after the fact the reader should also learn about it after the fact.
If you want us to be aware of his actions but not him, I would treat it as though telling the story from two POV's. Patricia Bray's The First Betrayal is a good example of handling this in just such a way. We get two POV's from two vastly different personalities who wake up bewildered at what has happened to him in the intervening timeframe.
If you want the MC to be aware that something strange is going on but he can't put his finger on just what it is, perhaps tell the story from only one POV but include a lot of reaction from other characters. i.e. the merchant shied away from him as though he'd just slain ten men... or use dialogue, either directly to the MC or overheard snippets...
Without knowing the story and what you wish to convey better it's difficult to say what the best way to handle your particular scene might be.
Bottom line is this. If your character doesn't know what happened, you can make great use of that. It allows you to hide facts from the reader. It allows the character to be lied to.
This should be treated as opportunity, not handicap.