I upvoted the question because (1) I appreciate your continuing effort to improve the quality of questions and answers around here, and (2) I think a short video presentation might work with drive-by questioners who aren't especially keen on researching the site's standards—especially if it means reading something. But I second Dan Bron’s suggestion that the video be about how not to ask a question. You could title it "VIDEO: How can I ensure that other people will downvote and close the questions I ask on EL&U?" or "VIDEO: Why do the people here hate my question?" Then present examples of five or ten types of questions that drive EL&U regulars nuts, and respond succinctly to each one.
A sample script:
Clueless question: Someone called something I said "hyperbole." What does that mean?
Response: Let me look that up for you in a dictionary. Or on second thought, why don't you look it up in a dictionary?
Clueless question: Please correct this sentence: "Happy with the strong performance in the test, it was decided that Ram give himself a five day rest."
Response: EL&U isn't a proofreading service. No one but you cares or will ever care about the particular sentence you just brought up. So it makes no sense for us to clog our archives with one-off questions like this one.
Clueless question: Is it "What are you inferring?" or "What are you implying?" I hear both words being used to mean the same thing.
Response: You see that white box—the one with the magnifying glass and the words "Search Q&A" in faint gray letters—near the top of the page on the far right-hand side? Type infer imply into it and click Enter (or Return), and you'll find that someone else has asked a very similar question about the difference between the two words. Conveniently, the answers are already there for you to consult and consider. English Language & Usage search: Use it before you ask.
Clueless question: What is a single word that means "marauding sea elf"?
Response: Have you ever stopped to consider that "marauding sea elf" might be a better choice than, say, "aggroaquasprite"? Sometimes there isn't a single word for some complicated phrase or multifaceted idea—and there shouldn’t be.
Clueless question: In English the word is "I have going" or "I was went"?
Response: If you are new to English and have basic questions about how to speak it, you might find a more welcoming environment at English Language Learners, a site created to help beginning and intermediate students of the language improve their grasp of it.
Clueless question: My company is about to release a new product, and we need a slogan that tells buyers this is the best thing on the market, a must-have item, and well worth the price. Suggestions?
Response: Your question isn't about English language and usage; it's about marketing. This site is not a free crowd-sourcing mechanism for composing commercial slogans.
Clueless question: What does Blake mean by "symmetry"?
Response: That's a tough question to answer—and not just because you've provided almost zero context for it. If you're asking about William Blake’s use of "fearful symmetry" in his "Tyger" poem, you're asking for literary interpretation—and we don't do that here, largely because it falls into the realm of opinion rather than fact.
Clueless question: I am so sick of seeing people use propinquity when they mean propensity. Making such a dumb, easily avoidable mistake simply defies reason. And don't tell me that if enough people say propinquity when they mean propensity, that will make it okay and we'll all just sit around in close propinquity (or is it propensity?) singing kumbaya. Am I right?
Response: You're ranting. Don't come to EL&U and rant.
This script may look harsh, but I suspect that it would sound less so in a video. In any case it covers some of the more common categories of bad or misdirected questions we get at EL&U, and newcomers might be tempted to watch just because (1) it's a video, and (2) the title is intriguing.