Watched the video. Don't think that is blow by at idle. But, some questions. Do you have the passenger side vented somehow? The bottom of the crankcase has to breathe. On the driver's side, the stock setup is a PCV (positive crankcase ventilation). If not vented on the passenger side, you will compress the bottom of the crankcase and start blowing the front and rear crank seals. On the driver's side, the setup is designed to pull oily vapors and recirculate them back into the upper intake manifold and burn them in the combustion cycle. The crank acts like a pump and pushes oily vapors up and into the driver's side valve cover area. On the passenger side, the system is set to allow clean air to enter the bottom of the crankcase via the passenger side valve cover hole/opening.
There are some pretty easy fixes. First, remove the driver's side valve cover, look inside, and notice some screws holding down a flat plate. Remove the plate and stuff some semi-course steel wool into that area and reinstall the plate. Make sure there is a small drain hole in the corner of the steel plate at the lowest point which would be the outside of the valve cover corner closest to the firewall. The steel wool will capture some oil vapors and condense them into oil drops which will flow down hill toward that 1/8 inch hole in the square plate. Second, you can purchase an oil coaleasing filter which will trap the rest of the oily vapors and deposit them in the container which can be drained about once per month. Third, if your motor is boosted, you can install a brass check valve with 1/2 psi of pressure which will close when the motor goes into boost. Forth, on the passenger side, can't recall exactly how the stock factory setup was designed but think a tube went from the air box to the passenger side valve cover. Thus, air could flow from that filtered area and head down into the crankcase, recirculate, and then head up into the driver's side valve cover where the pcv would allow the "blow by" to get burned in the motor. Blow by is kinda a technical term which means some compression gases are pushed by the rings into the bottom of the crankcase under boost conditions. During N/A engine operating throttle settings, the bottom of the crankcase should ideally be in a vacuum situation from 1 to 4 inches of vacuum.
Alternatively, some guys use catch cans (puke cans) to catch the oily vapors and ditch the pvc system. If emissions testing is an issue, the catch cans cannot pass the emissions testing visual inspection.
