that depend…
If you shot your actor moving but nothing else move no need for bluescreen. Because what don’t move don’t get blur.
If you actor most move and other item also, you can do most masking. You mask what you don’t want to get blur. But your actor can’t pass in front or beying a item who also move… I fact he can but it will mean a lot of work to rotoscop it…
Other case you need a green screen…
Shadu