DAM with frame buffer and Clocked video output

OK, now it is clearer. I would not try to implement that on my own, because Altera provides components for that. (except you really have to implement it yourself for some case)

You can add some type of SDRAM-Controller. I normally take the easy controller instead of the highspeed one, because it is easier to configure. The highspeed controller needs clockbridge and pll, because you have to alter the phase of the clock according to your designs speed.

So take a look at the SOPC-System I attached, I would design an easy output system to CVO like that. The configuration you must find out from the documentation of your dev-board. In Quartus you then add the pins to the SDRAM. (be aware, that dq is a bidir pin)

Good Luck.