Take a look at w2aew's videos and skullcom's videos for other great examples too.
No 30-second video intro crap, gets to the meat of the matter. No 30-second intro talk of what you're going to talk about... just go start talking about it!
Good lighting. (Important)
Good closeups. (not of your face, but of the work, the breadboard, the scope screen, etc).
Tripod mounted video! (can't stand shaky hand-held or moving head/gopro style videos)
No need to see your head talking all the time, once in a while will be fine. Just to give a sense of who you are.
Screen capture looking at a mouse pointer circling around, while I try to guess/follow where it went .... is a big, big yawn in my book. I lose interest quickly.
w2aew's (Alan's) videos are note worthy. He explains complex topics in such a simple, clear manner that you can't help but recreate his breadboard demos to see for yourself. He uses topics that you may have read of (and understood in a bookish way), but Alan demonstrates it on a breadboard using simple circuitry, in a practical way, using equipment you may already have... an old analog scope, or DSO, a breadboard and some power supply.
Watching someone fix a $7K test gear that you know you'll never own/use/have access too, and using an even more expensive tool to diagnose/calibrate/fix it... is a big useless video. I classify this as electronics porn, useful once in a while if you want to measurebate.
Watching someone unscrew nuts and bolts of what used to be a $20K server is a big bore too. "Tear down" videos is the fancy name. Like watching a scrap metal dealer tear down a car... "this is the car hood, this is the bumper, this is the engine, this is the transmission.... we unscrew these bolts and take them apart"... yawn!
Keep it short and simple. Spending an hour+ talking about all the details and minutae of some finished project you did for your company's client is a big bore. This video is only useful/interesting to a job recruiter. Big bore..... instead pick a small topic, say "output impedance". then say "this is how you can measure __blank__ using gear you already have in your lab." --- not "this is how you measure ___blank____ using a $30K test equipment."
And if you want to electrocute/shock yourself to be "funny" in your videos, please do it for fucking real and do it right the 1st time.
Good luck!