+1 for a Panasonic.
If you don't need 4K, something like a Lumix G5 or G6 would be fine, if you can find one cheap. Though they don't have a socket for microphone input (the G7 does).
The swivel screen is handy for video, especially if filming yourself.
For indoor Vlogging you can just about get away without an external Mic input but you really need an external Mic with "dead cat" baffle for outdoors (the little stick on ones for internal Mics aren't very good).
I have a cheap
RØDE VideoMic GO and it's excellent.
The flip-up screen would be on my "essential" list. Without that it's difficult to see if you are framed well and whether the camera focus is tracking your face or the book-shelf behind you.
The rule you should remember about film is that people will tolerate poor video if the audio is good but they really won't put up with poor audio.
As mentioned above Action-Cams give a horribly distorted view when used close up/portrait. I'd look for a minimum 50mm equivalent if I was looking for a "news reader" look or possibly 35mm for arms-length "roving reporter" style.
What style were you thinking of?
Some of my favourite Vloggers now use Chromakey (Green-screen) backgrounds to overlay amazing backgrounds on their video. I suppose it transforms dull little home offices into Manhattan sky-lines. It looks amazing ......but a step too far for most.