We don't have the context on this interesting clip regarding the exact location, date, or units involved, but it shows an ongoing battle filmed from a trench in eastern Ukraine.

The cameraman, possibly a sniper based on the precision rifle in the background, hugs the ground as small arms projectiles can be heard accurately ripping through the air just over the trench. Suddenly a high explosive munition, possibly a mortar round, lands within a few meters of their location, sending dirt and debris at them. Nervous laughter follows.

Should the Russian buildup around Ukraine turn into an invasion, or if Putin acknowledges the contested separatist regions of Donbass as sovereign states, the Minsk agreement will be dissolved and the current dynamics of the trench warfare stalemate will rapidly change as airspace and conventional Russian troop numbers will come into play. One could look at the various drone videos from the Second Karabakh War (2020) between Azerbaijan and Armenia to get an idea of how obsolete trench warfare has become without an observance of self imposed airspace imitations.