Strava subscribers can relieve activities on a dynamic, 3D map. Flyover is currently available on the Strava Android app but not yet available on the iOS app or Strava website.
You can see Flyovers for your own activities and any other Strava activities you have access to. Tap on the map of a GPS-based activity to open a detailed map screen. Tap the Flyover button in the bottom right corner of the dynamic map to play the Flyover video.
There is no way to export or share your Flyover from the Strava app; however, you may capture your video using your device's built-in screen record functionality.