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Wow, that is extremely high pitched. You can test the PCV valve by removing a covering nipple on it and holding tissue or a flame from a lighter next to that hole. If there is a vacuum and the tissue/flame is being pulled in the hole, you have a bad PCV. You can also open the oil fill cap when the engine is on and if the sound of the engine changes or there is suction while trying to lift the cap it would also indicate bad PCV.
I don`t think PCV valves cause such a high pitch noise, but worth a try!
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TOTALED  | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport
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