TimeLine
https://docs.unity3d.com/ja/Packages/com.unity.timeline@1.5/manual/index.html
Cinemachine Track
https://docs.unity3d.com/ja/Packages/com.unity.cinemachine@2.6/manual/CinemachineTimeline.html
Timelineでゲームスタート演出 https://zenn.dev/dsgarage/articles/1e58181bf007ca