The only one I know of is the Channel Surfing news articles that The Source / TWRoO / someone else lead with the help of other VGChartz members to gather the data. It stopped midway into 2009, though. This is the most recent article I could find: http://www.vgchartz.com/article/4393/channel-surfing-wiiwarevirtual-console-sales-chart-june-2009/
So 930,000 midway into 2009. It had been averaging 10,-20,000 a month for most of the time we did it, if I recall correctly. If it managed 10,000 a month up to now, that's 300,000 more. However, you have to take into account that there's a very large margin of error, due to the methodology used to ge the numbers.
Thus, I think it's safe to say that Ocarina of Time on Virtual Console is at somewhere between 1.0 and 1.5 million.
So that means, in total (minus the promotional disks) Ocarina of Time has probably sold about 12 million copies to date.
I describe myself as a little dose of toxic masculinity.