Describe the process and results you used to determine the force exerted by the hockey stick on the puck.

Hey mate here's your answer ⤵️

If you know the mass and can find the final speed of the puck, then you know how much impulse was applied to it. If you then take the known (from your video) period of time that the stick was contacting the puck, you can calculate the average force over that time.

If you want to get more sophisticated, you might be able to figure out the forces applied by looking at how the stick bends at any given instant, again from your video.