This short video shows two bunkai drills from Kushanku / Kanku-Dai / Kosokun-Dai / Kong Sang Koon. It was filmed in August 2015 at a seminar in Finland.
The demonstrations shown were an aid to memory that the students could film on their cell phones etc and take away with them. They had therefore already learnt these drills and what is shown is not instructional in nature. It may be difficult for those not there to follow what is shown as a result. I nevertheless hope this clip is of interest.