All of the library catalogs can be used to find physical media such as DVDs. You can limit your results to just movies and TV by changing certain search filters to not include books.
In the Beeghly Catalog, on search screen open up Limit Your Search box and change the Video Recording menu.
In OhioLINK, open the Advanced Search and change the Video Recording menu under Add Limits.
In SearchOhio, open Advanced Keyword Search and under Add Limits change Material Type to DVD/VHS.