I've been meaning to experiment with low-ISO settings, myself, to blur stream motion when the day is too bright for long exposures.
The "official" lowest ISO of my camera model is ISO 80. However, I found that I was able to achieve a lower value (either using overrides or through a script) of ISO 50. Continuing to reduce this further resulted in over-exposure due to the camera exposing for an unachievable ISO value.
It's very short; copy it into your own SCRIPTS directory and run it for each ISO setting and see if you get the same values as shown in the table in this sheet.
In my S3, that number is 227. I would be surprised if that is the same for all Canons.
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