I guess you all like having to spend shit tons of money on attorneys and spending time in the tank before you get sprung on bond. I get it. It's satisfying to get revenge on some scum bag that wants to steal from you. How much is that revenge worth to you and your family? Your freedom?
OP, it's not worth it. Probably the least legal exposure you would have would be from owning a dog and even then you're still open to litigation. A tough little Pittie will do the trick. If he shoots your dog you'll know. That's when you're 911 call stating shots fired/active shooter will bring PD to your front door but otherwise don't involve yourself in ANY interaction with him/her. If he attempts or enters your home you shoot him dead, call your attorney and have your attorney call PD while you calmly lay your weapon down and wait for him and PD to arrive. The fact that YOU initiated the call rather than them having to find you will setup the basis of your defense. Having the police look at the incident favorably for you since you called them will be what shows up on the report and is what the judge and DA will base their decision on in charging you or releasing you from liability. Actual justice and the law are almost polar opposites of each other.
BTW...how do you know he's carrying? Did he flash a gun into your camera shot? You can submit this to the police and file a report of an armed intruder trespassing on your property without mentioning the weed. The moment you mention weed, regardless of if it's legal in your state or not, will trigger the reefer madness response in them and will open you up to their preconceived notions about "potheads".
They probably already know who it is just by looking at your video since it's probably some dumbass crackhead that they've hauled in for various crimes. Doing this will also set up your defense if you do have to shoot the guy/girl. If you've reported prior incidents involving this person it will show that you aren't trying to take matters into your own hands. Courts hate when people do that and court is where you're going to be negotiating your freedom.