To view the video volumes you will need to have QuickTime® version 7 or later installed on your machines and it needs to be designated to handle RTSP streams.  1

Steps for downloading and installing QuickTime:
Step 1:  To download QuickTime® please go to http://www.apple.com/quicktime.
Step 2:  Click [Free Download Now]. 
Step 3:  Click [Save File]. 
Step 4:  Locate the saved iTunesSetup file and double-click on the icon to begin install. 
Step 5:  Once QuickTime is installed, change the player settings so that it is your default player.
Step 6:  Click [Edit], [Preferences] and then [QuickTime Preferences]. 
Step 7:  Under the File Types tab, check the following boxes “Streaming - Streaming Movies,” “MPEG – MPEG system, video and audio files” and “MP3 – MPEG layer III movies and streams.” 
Step 8:  Click [OK].

Steps to make sure that QuickTime® is the application designated to handle RTSP streams:
Step 1:  Open the QuickTime® control panel (in the Windows Control Panel or Mac OS X System Preferences)

Step 2:  In Windows, click the File Types tab. On Mac OS X, click the Advanced tab and then click the MIME Settings… button.
Step 3:  In the list, expand the Streaming item and ensure that RTSP is checked.
Step 4:  Try again after closing all web browser windows (at a minimum) or restarting the computer (preferred).

 If you are still having issues viewing files, it may be the browser. Mozilla Firefox is the preferred browser for viewing QuickTime videos. You can download a free copy of Firefox at http://www.getfirefox.com

Steps for downloading Firefox:
Step 1:  Click [Download Firefox - Free]. 
Step 2:  Click [Save] and select a location to save your file. 
Step 3:  After the download is complete, click [Run].