In OP's first example there's an implied your (or you) after mind...
1: “Do you mind [your] closing the window?”
(or)
2: “Do you mind [you] closing the window?”
...corresponding to...
3: “Do you mind my closing the window?”
4: “Do you mind me closing the window?”
Note that 4 has becoming increasingly common over recent decades, particularly in BrE. Syntactically, everything after the word mind is a noun phrase. As a general principle, using the possessive form (my, your, his) in such contexts is "dated", but it survives more in "Do you mind [NP]" because it's a relatively formal construction anyway (and people tend to stick to older forms in formal contexts).
Also note that we tend not to use mind in this sense unless it's part of a question ("Does your husband mind our/us meeting like this?") or a negation ("I don't mind your/you phoning so late at night"). That's to say although "I mind your/you smoking while I'm eating" is grammatically "valid", most native speakers simply wouldn't say it.
Let's consider the more general context and introduce another syntactically similar verb...
5: I like ice-cream
6: I like your kissing me
7: I like you kissing me
8: I don't mind your kissing me
9: I don't mind you kissing me
10: He doesn't mind our meeting like this
11: He doesn't mind us meeting like this
I've included 5 there as a clearer example of a simple "noun phrase". Although currently most native speakers (particularly, AmE) still use possessive my in OP's example (because semantically as well as grammatically, it's a formal usage), they're much more likely to use the accusative/object forms in 7/9/11 above, rather than 6/8/10.
In light of this ongoing shift away from the possessive in constructions of this general form, I think it's probably more useful to interpret OP's first sentence as a "cut-down" version of my example 2, and the second one as a slightly dated version of my example 4. You'll still encounter the possessive in various contexts, but I don't think you ever need to produce it yourself.
EDIT: In the interests of "balance", it's well worth considering StoneyB's answer to a very closely-related question, where the final "advice to learners" paragraph recommends using the possessive. I'm not going to disagree with that, provided you wish to master "formal" usage, and bearing in mind that it would be slightly "dated, odd" to use the possessive in informal contexts such as example 6 above.
Both are fine to say, but they mean different things. To see actors bring characters to life means exactly what you expect it to mean -- that you are watching actors as they bring their characters to life.
To see THAT actors bring characters to life implies that you are mostly interested in the fact that this is a thing that happens when you watch actors in a movie or a play. You might not even care about what they say or how they act. You might even hate the movie. But you are recognizing the fact that actors do bring characters to life when they act.
Also, I think you are missing another word in the sentence: "Part of what makes watching a movie FUN," or some word like that.
Best Answer
In the first, second, and fourth sample sentences, you already have a subject, the password, a boarding pass and the food, and therefore don't need to include an it. Although it may be more common to use in other languages, the it part is left out in English (I'm not sure if leaving it in is incorrect grammar, or just not done in practice).
However, if you add a comma after the subject, you can include it. The resulting sentence puts an added emphasis on the subject (though, this is quite uncommonly used):
Picture someone saying that sentence: The food
*pause*it is good.