You don't need a plugin anymore. Look to the bottom right of the video, there should be a download as option. Download as mp4 and drag the file into Vegas Pro. Mute the audio track with the button to the left of it (circle with a cross through) and drag in your audio file to a new track below it and line it up as best as possible. Highlight the video track and choose Insert/Video Envelopes/Event Velocity. Right click on the areas of the video track where you want it to slow down or speed up and choose Add Point. Then drag and move the sections in between them to suit and experiment with points and such. If you want a freeware program you're on your own...
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