Prasooon The online interview portion was not very stressful. Once you make an account, you'll watch a quick summary video that explains what'll happen.
First is a quick writing component - 10 minutes to answer some basic question pertaining to drafting an e-mail in a business setting. The example they give online is "Draft a follow-up e-mail to your admissions officer explaining your enthusiasm for Rotman". I think they just want to make sure that you understand what is appropriate, as opposed to making it a creative writing component.
The video interview portion (2 questions) is also very relaxed. Just be honest and coherent and you should be fine. You see the question, have a bit of prep time (maybe 20 or 30 seconds), and then you record your 30-60 second answer. I only have a sample size of 2 questions, but I suspect they're all similar, "get to know you" questions. For example:
- "What is your favourite X and why?" (e.g. book, movie, musician, role model, hobbie, etc.)
- Something situational, like "Describe a situation where you did Y? What did you learn?"
- Perhaps a classic "who would you want to have dinner with?" type of question. Just speculation.
I would recommend recording yourself answering a simple question on your phone or computer beforehand to see what you look like talking to nothing. The "hardest" part, I suppose, is getting accustomed to the set-up, rather than the questions themselves. They're not designed to trip you up at all.
TLDR: Not a big deal. Have fun with it! Hope that helped a bit
Good luck.