No. There is no connection between seo, traffic and QR code on your site. But it could help you generate sales or visits from other sourcers. (For example: Qr code on posters could generate traffic to your site
QR codes are useful for getting opt-ins for various things, but it will not bring more visitors. Rather, it's a tool to convert leads to prospects, and then prospects to customers.
Emmm... QR codes won't help you in getting more traffic but they surely will help you in convincing people to buy your products. I have seen many websites utilising QR codes in good way... the place QR codes with images and products and use them for redirecting their audience to other page which helps them in buying products from them easily.