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Technically this is possible - PSoC 6 supports FreeRTOS and simultaneous flash read/write (while flash is getting updated in one sector, code can execute from another sector) to enable this.
Our bootloader SDK supports BLE Over-the-air update for a complete Application (usually bigger in size). If you are talking about updating complete application (you can have multiple applications), then yes it is possible through the SDK itself. However, updating just one or two functions is not directly supported by our SDK. That said, it can be handled and implemented in application and probably a custom BLE service.
Meenakshi Sundaram R