it's from the scene file on the camera. scene file (camcorders) is sorta equal to picture profile (dslr). if you have a panasonic camcorder you can change your scene file which will adjust the way that the sensor captures light and color. in my opinion, better to get colors/contrast right in-camera instead of in post, but that also depends on your goals/style/etc. for the classic warm skate style look, i bet you could just search up something on youtube like 'skate scene file warm' - at least to learn what the different adjustments do. once you understand how it works, i'd recommend you go outside (natural light) with your camera and fiddle with it until you get it somewhere you personally like, don't just bite what some skate filmer has.
you could get the same effect through color grading but i don't recommend it, it will take forever and it will never look as good as it does with the right scene file.
asparagus is right, these guys have their white balance set to auto, that's why one day's worth of filming is grey and the other is more orange/pink. it's good to always have your white balance set manually so that you don't get crazy color differences between clips, 5600K is the standard color temperature for filming in natural light/sunlight. if you go lower, it will get more blue, if you go higher it will get more orange. you can still film with the warm look using a standardized white balance like 5600K if you adjust your scene file correctly. if you try to get the warm look just by using white balance, it will probably make your shadows very orange/red.
