The uploader of the video says:

Miraculously, everyone survived. The pilot will make a full recovery and the rest of us escaped with superficial
injuries and feel very lucky to be alive . This trip was much anticipated and due to our excitement we had our
Gopro cameras filming at various times. After flying up into the mountains for a morning hike in the Frank Church
River of No Return Wilderness we were planning on flying to a small mountain town for dinner. Due to warming
temperatures there was an increase in density altitude and we had a hard time getting adequate lift. After taking
off we hit an air pocket that made us rapidly loose altitude, pushing us down into the trees. The cameras were left
on for a couple of hours during the aftermath.