The interview is generally a simple chat with casual questions (what you do in life, family...) to access your language proficiency, and a quick check of some documents.
Generally, it's mainly a check of the passport, but you have to be able to provide all docs whose copies you sent in your package.
While not sure how they exactly take place via zoom, don't worry about it, there's no preparation to be had, just go with what the officer asks.
Also, many people now go straight from the online test to decision made, so maybe you won't even have one if IRCC feels they don't need you to have it!