Those two are oWoD, though the Camarilla existed in the nWoD (but it failed and disappeared)
Tremere : Old WoD only.
Ventrue : they exist in both. In both cases they are bloodlines (aka, it's hereditary from sire to childe)
Brujah : Exist in both, but the Bruja (without an h) in Requiem are a "minor" bloodline. (Requiem main clans : Gangrel, Ventrue, Mekhet, Nosferatu and Daeva ; the Bruja are a spinoff of the Gangrel)
These are OWoD. I'm not sure if the "concept" of those clans exists in the Requiem. I think the Giovanni exist as a bloodline like the Bruja.
These five are covenants, ideologies for Requiem. Basically they are like the Sabbat and the Camarilla, but they are not as opposed to each other as those two are. To make a long story short, they are political parties. In Requiem, your "sect" is more important than your clan (that just happens to be, like the color of your eyes or you nationality), because it's a choice
Go to the white wolf wikia
http://whitewolf.wikia.com/wiki/Main_Page when you do research some of the terms, they'll say if it's owod or nwod