How is Othello, in the final scenes, portrayed as a victim, including cinematic techniques to prove this theory in Othello?
Your question is difficult to answer because you are insisting upon "cinematic techniques" to make a specific point about a play written in the sixteenth century. It does not hold up to try, from a scholarly perspective, to create an analysis of a play written by Shakespeare using the script as if it was written to be filmed, rather than performed live.
This isn't to say that one couldn't create a film version of the work and then discuss that particular film in relation to the script, but the script itself, as written by Shakespeare, is not a screenplay and cannot be discussed as such.
As for the question of whether Othello is a victim, in the structure of the Tragedy, he is the tragic hero, and, by definition, is responsible for his own downfall. If you would argue that he was a "victim" of his own jealousy, that could be correct. But, as his final speech indicates, he bears responsibility for his own actions.
As for cinematic techniques, look at any filmed version of the play to see how directors have decided to film the final scenes, especially the strangling of Desdemona and the murder and suicide that follow. This is action that must be chosen to suit the production, as it is merely indicated in the text, and could provide the "cinematic techniques" that you are requesting.