First thing, if you have the credentials of the admin, simply log-in, in the SmartView catalog select the view/report and then actions -> Export template and then Import for another user.
I'll make an assumption that you already know this and you don't have the credentials. I'm going to suggest something that is not official but I tried on my lab, doesn't suppose to have any serious risk:
You'll need expert mode. The database of the of SmartView is located on $RTDIR/smartview/db/domains/<domain-id>/users/<user-id>/
Go to the directory of that user (you can't tell from the number but inside the directory you'll have username.txt which contains the username).
I suggest creating another admin, create an empty view with it (if nothing is created/changed it won't have a directory created), then copy the following files from the other user:
controls.xml, reports.xml and views.xml. Then you need to restart the SmartView process - $RTDIR/scripts/stopSmartView ; $RTDIR/scripts/startSmartView .
This will duplicate the views/reports/widgets that the user created to the new user. Then I suggest exporting template and importing template to existing user, verify it works and delete the user created for the transfer and the old inaccessible user so it won't continue to run scheduled jobs.
Kind regards, Amir Senn