Juries are generally charged with determining matters of fact; the judge matters of law. Even without jury nullification, a jury still determines whether the person performed a proscribed act, or did so with the requisite intent, etc.
When people talk about jury nullification, they generally mean the act of a jury actually believing that the person committed the act, but let them off because they don't think they should be punished for some other reason.
If that is axiomatic, it's not the constitution of the US. I don't know about other jurisdictions, but it's silent on the exact duties of a jury.
The only way to preclude jury nullification is to infringe on the rights of the jury as the sole determiners of fact, as you put it.
Without adding another non-jury body that can overrule the jury on what actually happened, how can you ever get rid of the possibility of jury nullification?
The most common place for this to happen is in civil court. A jury can come back with "11ty billion dollars" and the judge can decide "Ok, they got a little overzealous with that, $100".
I've always found this deeply troubling. If the law isn't clear enough for 12 jurors to determine if an act was legal, then how is it possibly just to hold the accused liable transgressing it?
I don't see much practical difference between this and ex-post facto laws. In both cases, a person can be convicted for an act that wasn't obviously illegal at the time.
Sometimes this is relatively easy ("you left blood with your DNA at the scene") and sometimes hard (you have 3 eyewitnesses, they have 7 people claiming an alibi).
Not so easy when you realize that DNA labs are shockingly prone to making type II errors.
Jury nullification is ignoring the law for any reason. In fact, it seems like the normal, "classical" interpretation is to find not guilty to laws you don't agree with. It's also used for people that did it, but the jury sympathizes with them. Otherwise, it could be they think the penalties are just unfair.
All of these things are jury nullification.