Slowing down frame playback isn't going to create motion blur. The blurriness is just whatever existed in the individual frames. In still photography high speed shutter is used to reduce or eliminate blurriness of a fast moving subject, so...
As long as you maintain VLOS meaning you control the drone by visual sight, not using any looks at the controller screen AND you fly when the sight visibility is at least 3 miles you should be fine. Losing VLOS and reduced visibility means the...