There are many copanies and individuals that offering type of this service.
Have you search on Google or Fiverr for these? Some could offer you with low rates to create video marketing for your company.
What are you intending to market exactly? Are you trying to get a company to do product reviews or make videos of your companies products? Please give us more information so we can help you out better. Our company does video work and we do marketing for it but I'm not really sure what your needs are.