Just to add to this excellent discussion you could only say:
"Je suis en train de regarder un film." (not voir here).
It's the same distinction as-
To hear (entendre) and to listen (écouter) .
The former is a passive action, the latter requires input from the subject .
Hope this helps!
According to Duolingo, "regarder" is used with more intent while "voir" is used more passively
Elle va voir la ville - She's going to see the city
Le chat regarde le poisson - The cat is (actively) watching the fish
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