My advise would be to get rid of Plesk on that server, or install Wowza on a separate server. I’ve tried myself to make Wowza works with control panels like Plesk, CPanel, etc. and it’s frustrating. It doesn’t help to move the content folder to a place that is accessible by Plesk, because Wowza reads the files and streams the content over HLS, RTMP, or whatever Streaming protocol you chose.
The one thing you can try, is to edit the VHost (either via the Engine Manager panel, or directly in VHost.xml) and set the SSL port to something different than 443; e.g. 4430. Then restart Wowza and you should be able to access your streams via https://[ssl-cert-domain-name]:4430/vod/… That is: if Plesk allows processes to use ports outside its control.