India, Aug. 6 -- When Victor Riparbelli launched his AI video startup in 2017, artificial intelligence was still a niche technology rather than the global phenomenon it is today. Five years before ChatGPT introduced millions to generative AI, he believed AI would completely reshape how videos were made.

That vision failed to impress most investors. More than 100 of them rejected the idea, calling it unrealistic. But one cold email to billionaire entrepreneur Mark Cuban changed the company's future. Today, Riparbelli's London based startup, Synthesia, is valued at $4 billion.

Speaking to CNBC Make It, the 34-year-old CEO reflected on the decision that transformed his business.

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