Yes, it will support the GTX 950.
The Asrock h61m-vg4 motherboard has 1x PCI-E 3.0 x16 slot and 1x PCI-E 2.0 x16 Slot.
So it will be compatible and will be able to run!
Also, this is in the correct part of the forum, so no need to worry about that!
Hope I helped,
Have a great day!
- Dom.