Media can be found using the library catalog. DVDs (and some older VHS) will have their call numbers preceeded with MEDIA. Most DVDs are found on the first floor near the computers.
Some items are found at the Circulation Desk. The call numbers for these items will be preceeded with MEDIA, CIRC DESK and a 2 or 3 digit number. You will need the item number to request the item at the desk.