I am really not sure where to get the flash player and/or video driver. Is it on the DVD like Mandriva, just not installed by default or do you need to search for this online?
YaST>Software management and then search for flash. With video drivers it depends on which driver. Most are detected at install.
Another source with one click collection can be found here: openSUSE Community Wiki
You need to look for the Multimedia section.