I only remember some details, and unfortunately, in addition to youtube having a worthless history system (meaning you can't search it, making it totally useless) My favorites disappeared at one point, so I no longer have any way to find it again.
It was a commentated video, although I don't recall any of the people involved.
I did some research, and I know that it was on the Metalopolis Map, with the Two golds in the center. It was Zerg vs Protoss, with Zerg to the south-east.
The match was extremely long, since the match ended with most of the map mined out. I think it was longer than 45 minutes. I also know Carriers were revealed near the end, which resulted in the commentator noting that you don't usually try to carrier-proof your base.
I believe it was the finals in a tournament or similar. Also It was a Wings of Liberty match, and I am pretty sure from before HOTS came out.
I already spent two hours trying to search for it, but I can't filter it down enough, lacking even information on any of the players involved.