It's possible that the first few views on your YouTube video came from suggested videos, which are a type of organic traffic. Suggested videos are recommended to viewers based on their past viewing history, search queries, and other factors.
If your impression click-through rate is still zero, it's likely that your video hasn't received any clicks from YouTube search results, browse features, or external sources. However, it's important to keep in mind that YouTube's algorithm is complex, and there are many factors that can influence how your video is recommended to viewers.