If you dont mind recording ingame sounds with video together for further velocity manipulation within your video editor, my advice is to use the method for exporting image frames from the game (link in Kaleu's post) and importing them as a image sequence for your project. WA videos are better that way, and you can still record sounds separately. Check my videos from my signature below - quality is still not the best you can get, but it's good enough to not annoy more demanding viewers