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It depends on the type of paint used in the existing painting. If it is an oil painting, you will need to use oil based paint. If it is a water based medium, like acrylic, use a water based paint. Gesso will work well for this. It is inexpensive, opaque and will help level the texture of the existing painting. You may want to lightly sand the painting before painting over.
As long as the oil pastels you use contain INERT oil (such as mineral oil) in the binder, rather than chemically active oil (such as linseed oil), you can paint directly on paper. I have oil pastel paintings I did more than 40 years ago directly on pastel paper, museum board, and 300 and 400 lb watercolor papers.