Does adding a service description video helps in boosting sales?

I am somehow confused here about this. please i want to know if adding a video to a gig service description helps to bring in traffic visitors, be it in social media marketing or on freelance sites or others ? I have some arguments with some SEO sellers and some argued that it helps while others said it doesn't bring in, stating that it depends on the way you write up your service gig description. OR generally speaking, do videos help in bringing in more traffic and sales and thus profit?
Please my fellow sellers and colleagues here, i need your responses.