You cannot mix the two, since they are different systems. VGA is a raster based display standard and interface, while vector is not.

The problem with your question is that you are asking about a 'vector based VGA graphics card'. Older CRT technology could be used for either vector or raster displays, but LCD's, Plasma screens, OLED's, etc are all fundamentally raster based and cannot easily be used in a vector type mode. This is very different than the interface for a raster display. The electrical interface to a vector display has signals for the X and Y location of the beam, the intensity, and sometimes the color. A different form of vector display is the systems used for laser light shows. There are very few color vector displays that were used, and the best example of that is the arcade game Tempest. The best examples of this are analog o-scopes, and the arcade games Asteroids and Battlezone. Instead of drawing things a scan line at a time they actually traced out the shape of the objects. Years ago, mostly in the 70's and early 80's, there were some true vector displays. The video interfaces used to talk to these displays are based around a raster interface. Meaning, they redraw the screen one scan line at a time. Modern displays (TV's, LCD's, Plasma, most CRT's) are raster based devices.

So, bear with me on this and understand that my motivation is to explain how this stuff works and not to make you feel bad. And there is no good way to answer your question without possibly making you feel bad for asking it- which is a shame because I think that there is useful info in the answer. Unfortunately, the answer is 'it doesn't work that way'. I think your question is one that a lot of people have probably wondered about at one point or another.

Please, please, please don't take what I'm about to say personally.

Open source vector graphics