Actually, you should be checking with your loan officer. There may be restrictions regarding VA loans and closing costs. But to give you a quick run down of seller paying buyer's closing costs, let's say for ease of understandings that a seller has accepted an offer (without included sellers closing costs) for $100,000. So normally you would have a mortgage for $100K. Now you realize that you don't have the money for closing costs. But the seller MUST get the $100,000 in order to pay off his mortgage and costs. So you would have to re-write the offer or an addendum to the offer raising the offer to say $105,000 and have the closing costs come out of the seller's proceeds. Now is the seller actually paying the closing costs? No, you are since now you will be actually getting a mortgage for the $105,000. The house will have to appraise at the higher amount as well.
Depending on the type of mortgage you are getting, the amount that the seller can "contribute" (although in fact they are not really contributing - it is only a bookkeeping arrangement) may be limited. I have seen it as high as 6%, but sometimes as low as 3%. Check with the loan officer that you are working with and they should be able to tell you.