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As far as I know it is currently not possible to do that with Native Camera. I read once someone suggesting a patch to access more camera parameters. Here it is:
http://code.opencv.org/issues/1789
According to this, since version 2.4.0, more parameters can be accessed, but by inspecting the code of the patch, ISO it is not one of them.
I think this is the latest information on your problem, maybe you have to submit a feature request or do a patch yourself. If you are thinking about doing a patch, check the link above, it has the code for the patch that you can learn from.
