Do I need to terminate my oscope in a specific way for viewing video signals?
If you are looking for accuracy and (more probably) avoiding reflections then the \$50\:\Omega\$ oscilloscope inputs will need a \$75\:\Omega\$ feed-thru terminator of some kind. You can buy them or make them. The T connector I'm sure you are familiar with. But you can see the T, the termination, and both hooked together here:



Also, you will really wish you had triggering that recognized parts of the signal you will look at. Assuming AC coupling, hopefully you can find (under the triggering menu) something that talks about "video" and allows you to trigger on odd or even fields and even specified horizontal line numbers.

Note: Image borrowed from the page located here