There are a lot of evil non-violent ways to teach people lessons. If and when you get the picks and videos I would go on every hunting blog site and post, post on the DRN and other government websites that let you, put up laminated pictures of the guy and his buddies with a big red Trespassing Poacher on the pics all over the local area at every store with a stick up board. Grocery stores, drug stores, sporting goods stores, you name it. And just keep going by and posting pics as they are taken down. Get his plates and find out his name. Mail him, his wife and his buddies and their wives pics of their illegal activities ( anonymously of course.) Send the pics to the local District Attorney with a letter an request to prosecute. Make sure it is notarized! Send the pics and a letter to the head of your game department, the governor and your senators. Mail the pics to his pastor and complain politely about his unchristian behavior. Never get nasty, never get violent. Talk about him and his buddies to everyone in your area. Flat out make his life miserable. And, prosecute him to the fullest extent of the law. The only way these things stop is when they are brought to everyones attention and the scofflaw suffers humilitation and financial loss.
If they want to play games. Superglue in the door locks, potatoes in the tail pipe, etc.... always are good for a laugh. A nice bright red poacher painted on his rig always makes a point. ( these are of course illegal actions ) Cut up letters from a newspaper then put together with kids glue left in their stands explaining what is about to happen to them etc.... etc.... etc...... When the law is abused and the CO ignores you the game is on!
As for being threatened or my equipment damaged. The law has nothing to do with my personal safety that superceeds the law and goes into my constitutional rights. When trespass is ingnored that is again a constitutional issue. When either is threatened, I know exactly how to deal with it. Tolerance of this behavior is why it occurs. Punishing it eventually leads to it stopping.