From what I can gather this is the general plot. The film takes place at the base of a serial killer which a group of ghost hunters have visited in order to try and get in contact with the spirits of some of his victims (I assume the psycho is no longer in business). Once at the house however the hunters find no end of hostile ghosts who have no intention of letting them leave alive.
The trailer for Ghosthunters is below, sure it is always hard to tell what a film is like from its trailer but it reminded me quite a bit of House on Haunted Hill (1999) which can only be a good thing. The ghosts have cool make-up effects on them and the plot device of only being able to see ghosts whilst wearing special headwear is applied. Check out the trailer below to see for yourself.
Ghosthunters from The Asylum Net on Vimeo.