The suggested `YXZ` order from the video does not work in Blender because it uses the `Z` up axis convention, whereas Maya uses the `Y` up as up axis.

If you want to get a setup like the video, where the gimbal lock occurs when looking up or down, you need to parent the camera to an empty and rotate the empty `90°` on the `X` axis, then set the rotation order on the camera to `YXZ`.

Only changing the rotation order on the camera can't work, the gimbal lock always happens at `90°` on some axis and the camera is at `(0°, 0°, 0°)` when looking down, so this extra parenting is needed.

That being said, I think the standard `XYZ` rotation order in Blender may actually be better for cameras. It will give you gimbal lock when rolling the camera `90°` sideways, which is perhaps even less common than looking down or up.