In the process of a kitchen remodel, and we are looking to move the sink to the center of the window. It's current location is about 2 1/2 feet to the left and the drain vent goes to the left, through 3 2x4's then up through the ceiling and roof...

I include a brief video below, which hopefully shows the situation. It looks like all 3 2x4's have been sectioned-out completely to make room for the drain pipe. Structurally, that does not seem desirable. Since I now wish to go over to the right further, that would mean the vent going through at least another 2x4 under the window. I am reluctant to take that same approach - hacking-up another 2x4.

Thoughts, recommendations?

Here is a link that might be useful: Drain Pipe Vent