Uninstall openshot
To remove just openshot package itself from Ubuntu 14.04 (Trusty Tahr) execute on terminal:
sudo apt-get remove openshot
Uninstall openshot and it's dependent packages
To remove the openshot package and any other dependant package which are no longer needed from Ubuntu Trusty.
sudo apt-get remove --auto-remove openshot
Purging openshot
If you also want to delete configuration and/or data files of openshot from Ubuntu Trusty then this will work:
sudo apt-get purge openshot
To delete configuration and/or data files of openshot and it's dependencies from Ubuntu Trusty then execute:
sudo apt-get purge --auto-remove openshot