Yes, it can work in principle, but it’s usually not the best solution. Chroma key depends more on having an evenly lit, consistent background and good separation from the subject than on “green” itself. A textured white wall will still be textured when lit green, so the same unevenness and keying problems remain.

A white wall can be turned green if you have enough subject-to-background distance and can avoid green spill on the speaker, but getting a saturated, even green wash on a wall is often harder than it sounds—especially in a tight space.

In practice, a smooth green fabric or foldable green screen is likely to work better and be easier to light than a textured wall. If you already have the green lights, it may be worth testing, but don’t expect it to outperform a proper backdrop.

If keying isn’t mandatory, another option is simply lighting the background differently or using newer AI matting tools, which may reduce the need for a true green screen in some cases.