First point it's a probably a phone video recording.. can't hide any cheat on this screen. It's not a re-played demo, we can see tab score list, also console controls in use.
But I know skeptikals.. Is there any 2nd screen on the side out of the camera and cheat running? Let's go further
1:05 -> checking following commands thru console "r_polygonoffsetbias 16" and "r_multiGpu 1": nothing with cheats, the first controls the distance to show textures on walls, the second allows multi processors to be in use with cod2. Both fonctions are allowed to be used.
4:35 -> jumping on german spawn roof: a jump is a jump, not a glitch. To my opinion no problem with that^^
8:30 -> Ennemy spotted on radar at mid garden, pre aiming the door from stairs have nothing special.
8:36 -> Ennemy jumped close, probably A garden, able to be heard. The same for the steps and reloading getting closer.
8:46 -> easy bash^^
Not enough suspicious to me, can you post more?