Your video is onboard. Which means it is build into the motherboard. You will need an expansion card. You will want to verify that you have a PCI-E x16 slot available, some of those oem boards do not have them. It looks like the black slot in the picture.
Then you will want to look at the power supply and let us know what the wattage is. My guess is about 300W or less.
You mentioned you want this for streaming video? Is that all you will use this for? No gaming I assume.