It was in the list for me. Did you see the information about changing the spelling of the word "repository" to "repostory"?

I went through all the repositories listed in the Application Catalog, and all of the urls that contained the word repository I changed to be spelled "repostory".

After I did that and refreshed the catalog, I could install Video Center. (At least, I'm pretty sure that's when it happened!)

I hope that's clear.