Sounds kinda like exhaust to me from the video. The 'tick' is different than a lifter tick would sound like. More like manifold leak. Check around the exhaust ports on the manifolds. If you see a spot of black soot that means you have a leak right there. If this is indeed the case do not simply tighten the manifold bolts harder to try to stop yhe leak. You can check to be sure they are torqued properly, but never overtighten the manifold bolts to try to stop a leak. Gasket replacement is the only good route to take.