I'm afraid this is a hard question for me to answer because it somehow comes naturally to me. I honestly didn't believe people at first when they mentioned how potent and emotional scenes got, but when I got older and there were certain scenes I really wanted to punch people in the gut with, the response was basically what I wanted, but apparently it hit people even harder than I expected. That's when I realized that I just have a way with words, and it's my greatest strength when it comes to the characters.
I think the best way I can describe it is when I write, I envision everything like a film. I have a particular way of how I want certain scenes to be framed, how the "camera" is panning a certain way, how the lighting should look (having shadows on the face in particular is what helps convey emotion than just seeing someone's brows and lips wrinkle), what dynamics (such as wind and rain--in film this is the "practical effect") should come in where, the choreography of how characters are to move, et cetera. I listen to certain music at certain times to get the desired effect I want, I spend hours practically day-dreaming (well... storyboarding, I suppose) up scenes but I try to jot down notes and flesh them out--I just really try to make the "show, don't tell" stick out so that way it plays out like a film, like someone is actually watching it.
But that's just me--it always has been how I did it even before I studied film and video. It's honestly just something I came to develop over time, so it's definitely something people can get the hang of if they practice enough or study enough subjects like, I dunno, psychology to better get inside characters' heads. Observation helps a lot, and it doesn't hurt to take cues you like from your favorite television shows/movies, but you should still study those scenes and learn why it is they work as emotional pieces, and why it is they stand out to you. Otherwise, you're just copying someone else's work without having put in the effort to learn for yourself how that came to be. But for the most part, it's something that you just really wanted to do/see that you don't believe others have done before, so you make the effort to make it a certain way, and the reader will pick up on that.