The pair went missing on Sunday morning. They were staying with other family at a holiday home by the lake.
A resident said a video of the tragedy was filmed by a family friend of the deceased from the shore and it had proved vital for searchers to pinpoint the area where the bodies were located.
It would have been near impossible to have found the pair without the film footage to locate the spot where the pair were last sighted, he said.
He downloaded the video on to a laptop to find the area where the pair disappeared, enabling police to draw a straight line from the shore out 100m to the spot in the lake.
That video has been forwarded to the coroner, as well as the kayaking equipment.
The pair went missing while kayaking near the Bayview Rd boat ramp about 11am.
Both bodies were eventually located and recovered by a group of four divers within a 100m radius of the beach.