The way I had it implemented was a single image - you just insert it like any other image and it uses the HTTP referrer URL.
Problem is the image proxy used here on steemit means no referrer URL and thus no way to track which post it is.
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ok.. thank you for trying. I will be waiting, as will many others, for Steemit to allow this or add this on their own.
It is possible to do it without unique visitors - i.e counting ALL views, not just unique views. This could be done by generating a new image URL for each post and we could have trivially added it into the editor.
Unique visitors are tracked using cookies - which don't pass through the image proxy. Since we can't track unique views the idea has been dropped as not being very useful.