Solution

First you have to find key1 and key2 at Dreamhack by finding the two locations in the video where the VR controller is used to indicate where the keys are hidden. The rectangles, in the image on the task page, overlap each other with a number of squares. By using the keys, you get a number of pairs of colors. For example the yellow and red overlap by 5 squares. This way you will get 8 numbers, that can be used as positions in the alphabet, finally resulting in the word reaction.