This appears to have been a segment of let's play footage, a face-cam section occupying the film's upper corner and depicting an unshaven man sitting within a windowed bedroom.
Maintaining an enthused monolog, the youth's upbeat commentary plods along for most of the video, undisturbed by intermittent, inhuman screams and distant detonations.
Indeed, even when the sky beyond his window abruptly darkens, the man shows little reaction save for moving to turn on an adjacent lamp, his commentary swiftly resuming despite the device failing to turn on.

Minutes pass, and, following a particularly violent glitch, an amorphous, white shape can be seen suspended in the gloom, some distance beyond the window.
A chain of malfunctions suddenly begins, each glitch rendering the screen dark.
With every glitch, the form grows steadily closer until its visage is suddenly pressed against the glass.
Bearing the shape of a woman, with patches of fish-like scales knitting between jagged rows of protruding teeth that emerge from its skin, the naked aberration grins with a mouth full of slithering tentacles, its eye sockets replaced by gnashing maws, and many dozens of staring eyes sunken into its undulating flesh.
Another malfunction darkens the screen, only for the view to be nearly subsumed by the nightmare's writhing face when vision returns, the creature's rotten, bloated body merging straight through the still-babbling man's trunk.
A final malfunction robs the footage of visuals, and when it returns, only the man can be seen—sitting quietly alone, his bloodied, empty eye sockets staring at the camera, his toothless maw gaping.
The film goes black, and for the final minutes, only the man's soft crying can be heard.