I’ve tried a little bit and could get it working the following way:
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place the image file in the conf/icons/classic folder of your openhab2 installation (see Iconset (where is in OH2?)
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created the following sitemap entry:
Image label="test" icon="camera" url="http://serverip:8080/icon/filename.png" refresh=60000'
where you just have to change serverip regarding the ip of your OH2 server and the correct filename.
as an alternative you could also use the WebView Item in you sitemap:
Webview url="http://serverip:8080/icon/filename.png"
but there you go without the automatic refresh.
Hope that helps 