The activity of making vlogs — filming yourself talking to a camera and posting it as a series. Again, mind the dictionary line you were given: it describes a vlog, the thing produced, while vlogging is the doing of it. The word works two ways. It is the -ing form of the verb vlog, so you can say "she was vlogging the whole time we were at dinner", meaning she was filming and narrating. And it is a noun for the whole activity or field, so you can say "vlogging changed how young people learn English" or "he got into vlogging during the pandemic". It also sits in front of other nouns: a vlogging camera, a vlogging setup, vlogging tips. The feel of the word is casual and modern, and it can carry a small edge — to say someone "was vlogging at the funeral" is to say they were filming when they should have been present. Two g's, and one syllable at the front: "VLOG-ging".

拍 Vlog、經營影音部落格（這件事）；台灣口語就說「拍 Vlog」