Valve put VR support for Dota 2, just in time for the International.

Now, don't expect to PLAY the game with VR, it's just for expecating but while watching the matches with VR may be an interesting novelty, I doubt will be that good.

The camera is already in a good position to see the action, and there isn't that much to see in the dota map. Basically, outside using it once to see what the big deal is I fail to see the appeal.

Still, I may be wrong, maybe the experience is awesome, I'd give an honest try but lets say I won't go out to buy a VR set just to watch EG throw in 3d.