Baikal-GVD is a cubic kilometer scale neutrino telescope being constructed in Lake Baikal.In 2022 it consists of 2880 optical modules attached to 80 vertical strings.Detection of neutrinos is based on detection of the Cherenkov radiation emitted by the products of neutrino interactions.In this contribution, development of the double cascade reconstruction technique is described.The first event rate estimation from Monte Carlo simulations of tau neutrino double cascade events as well as the background event rates are presented.