If you're referencing a film version, I'm not sure which production you're studying. However, there's certainly plenty of textual evidence that shows Othello to be a victim at the end of the play.
First, when Othello realizes his error (that is, after Emilia reveals the truth about the handkerchief and Iago kills her), Othello reveals a desire to be punished.
Whip me, ye devils,(320)
From the possession of this heavenly sight!
Blow me about in winds! Roast me in sulphur!
Wash me in steepdown gulfs of liquid fire!
O Desdemon! dead, Desdemon! dead!
O! O! O!(325)
More telling, thouth, is the blame Othello places on Iago. First, he requests that someone "demand that demidevil (Iago)/Why he has thus ensnared my soul and body?" When Iago refuses to respond, Othello enters into his final lines of the play, in which he claims to be a good, noble person whose mind was manipulated by Iago:
Soft you; a word or two before you go.
I have done the state some service, and they know't.
No more of that. I pray you, in your letters,
When you shall these unlucky deeds relate,(390)
Speak of me as I am; nothing extenuate,
Nor set down aught in malice. Then must you speak
Of one that loved not wisely but too well;
Of one not easily jealous, but, being wrought,
Perplex'd in the extreme; of one whose hand,(395)
Like the base Indian, threw a pearl away
Richer than all his tribe; of one whose subdued eyes,
Albeit unused to the melting mood,
Drop tears as fast as the Arabian trees
Their medicinal gum.
Here, Othello notes that he is "not easily jealous," but that when he is "wrought," (in this case, obviously, by Iago), he is "perplex'd in the extreme." Again, these lines evoke sympathy in audiences, as Othello realizes his wrongs and takes his own life as a form of self-punishment.