I threw my cents at a discussion forum and mentioned two ways to create a video of a flying helicopter with rotor blades ramaining standstill - both approaches after capturing a video of a flying machine with a normal camera (without variable frame rate recording).
I felt trying! Original video was grabbed from YouTube.
Option 1: Use a transcoder and experiment with different output frame rates until the blades are seen standstill.
Option 2: Use a video editing software, remove many frames so that blades are seen standstill.