Gotta watch your histogram when recording... if you have your shutter at ~twice your FPS, have iso all the way down, have aperature stopped down/ closed down all the way F/11 or however high it goes, and your histogram still shows highlights blown out, you’re going to need ND Filters. Then you’ll have to edit in post to bring up the shadows and underexposed areas...
Edited to say if you’re going to correct in post, set your WB to custom not auto. You don’t want it changing all over the place, that’ll make it harder to edit
Good luck, still learning myself so practice makes perfect!!