Hi,
Thanks for the interest in EDD Tickets.
It maybe possible to give event owners the ability to check in their attendees without seeing/accessing other organizers’ events.
However, it is not a feature we have and not something we can help include on the plugin through our support.
If you would like to request that feature please head to our UserVoice Page and add your own or upvote that feature as they will increase the chances of it being added to a future version.
http://tribe.uservoice.com/forums/195723-feature-ideas