This was shot over the course of 4 months during ~25 flights using a DIY FPV drone. It shows the transition from winter to spring in the Transylvania mountains, the Carpathians (Bucegi, Piatra craiului, Fagaras).
Everything is custom built, even the battery on the drone which is using Lithium Ion cells similar to the ones you find in Electric cars. More details about the drone here: rotorbuilds.com/build/13379
The camera that was used is a GoPro Hero 7. None of the shots were stabilized in post, everything was shot using ND filters (8, 16 and 32) depending on the amount of light.