If you want to know whether something is an icon or just religious art, I would start with the question "who does this depict?" Most other forms of art you can ask "what does this depict?" and have some sort of answer -- a person, a thing, an idea, an emotion, etc. But icons depict people (the rare exception being something like the cross or the throne of God which still depict Christ though sometimes without directly depicting Him.)
In the video that was posted, it wasn't people being depicted -- not Christ, not the Theotokos, not Saints -- so it can't really be an icon even if it makes us feel things like compunction or remembrance of death.
Icons are a place where we come in contact with the people depicted. The term "Windows to Heaven," though popular, is weakened by or understanding of what a window does. For us windows let us observe the outside while keeping the inside in and the outside out. Contrast that to windows without glass in them -- an opening to the outside world which lets the outside in. Or contrast it to old ladies in a New York high rise yelling to their neighbors in the building across from them and stringing their laundry from window to window. Icons are a place to interact with the Church Triumphant, not merely something that shows us some truth about something.