In Kingsman: The Secret Service Gazelle is disabled. I was surprised to discover that the actress playing the role (Sofia Boutella) is not. How were the scenes with her shot? Did she actually wear limbs, or had a stunt double, or it's just special effects?
They likely had Sofia Boutella wear special socks/coverings and added the assasin prosthetics later.
Effects like this have been achievable for quite some time now, as shown by the special effects shots of Gary Sinise as Lt. Dan in the film Forest Gump. Sinise wore blue socks during filming, and his legs bellow the knee were digitally removed in post production. For some scenes they may have used a double that was also a double amputee, but given how far special effects have come since then, and the level of action required, I doubt this is the case.