The phrase "allowed the viewer of" is correct and usable in written English.
It can be used when discussing how something enables or permits the audience to experience or perceive something in a certain way.
Example: "The film's innovative cinematography allowed the viewer of the story to feel immersed in the protagonist's journey."
Alternatives: "permitted the audience to" or "enabled the viewer to".
In that video, the audio allowed the viewer to create a narrative out of the visual confusion.
In this paper, a software technique is presented that allows the viewers of web sites to build their own personalized portals, using specific areas of their preferred sites.
We had this awesome location in Los Angeles, where we shot a video that allows the viewer to choose one of four different points of view, four different story lines, as I sing and dance through this building from the rooftop down to the bottom floor, and get inside my Lincoln [MKZ sedan] and drive away.
Researchers at the Massachusetts Institute of Technology and Stanford University have created photographs which allow the viewer to change their point-of-view after they are taken.
Cinematic visions of apocalypse, as Susan Sontag wrote in her 1965 essay "The Imagination of Disaster," allow the viewer to "participate in the fantasy of one's own death" and "the destruction of humanity itself".
Its fanciest feature is a cool magnetic button which the phone can sense to allow the viewer to control some of the on-screen elements they are seeing.
The facts with no spin, no words, just pure images allow the viewer to understand the depth of humanity in times of decisions, actions, despair, historical events and joyous celebrations of life that surround us.
A circle of four screens, one for each season, allows the viewer to walk in and out of the lives of the bulbs and their grower.
The Max Planck Institute for Solar System Research, which leads the Osiris camera, has put out two very slightly off-set versions of the scene, allowing the viewer to get a 3D impression of the comet when wearing stereoscopic glasses with red-green/blue filters.
Chow doesn't allow the viewer to experience much more of the Foxworth family estate than the two floors of the attic.
