In a blog post by Gleb Bahmutov, a new trial feature called experimentalRunEvents is introduced for Cypress, allowing developers to run Node code before or after executing a spec file using event hooks that require operating system access. This feature is demonstrated through a tutorial that showcases a playful application of the after:spec hook, which re-encodes test spec videos to appear like old vintage movie reels as an April Fools' joke. The process involves utilizing the ffmpeg utility to adjust the video colors to a yellowish hue and overlaying scaled scratches, aided by additional tools like ffprobe for video resolution adjustments. The tutorial provides a detailed guide on configuring and enabling these experimental hooks, with a focus on how to create and combine vintage video effects, ultimately producing a nostalgic effect using Cypress's capabilities.