Degenerate108 said "I don't know which hand you're talking about, but that canister he's holding in his right hand looks a lot like bear spray.
People need to be mindful, they're going through vehicles armed, and would probably not hesitate to use it on someone trying to stop them. "
If you watch the video you can see a cord of some sort coming up from his hand and he is holding something up to his mouth. You can see him talking into whatever is in his hand or maybe he's just talking to himself....
On a side note people that have these Nest cameras are they worth buying? I see you have to pay for a membership to record video otherwise 3 hours only which would be pretty pointless.