Ecophagy is a term coined by Robert Freitas that means the literal consumption of an ecosystem. Freitas used the term to describe a scenario involving molecular nanotechnology gone awry. In this situation (called the grey goo scenario) out-of-control self-replicating nanorobots consume entire ecosystems, resulting in global ecophagy.
The video depicts various landscapes and environments that’s been affected by several unknown anomalous forces (presumably artificial or unearthly)and been transformed in to an unrecognizable nature.
The essential idea is to portray the aftermath of manipulated synthetic nature and life forms.