Welcome in the forum!
Are you needing Bluetooth Low Energy functionality for your design? You didn't mention that.
There are some development kits as the CY8CKIT-042 BLE (when you need BLE functionality) that have got the capsense slider on. Connecting 8 additional LEDs is quite easy, Programming an LED lighting interface using a PrISM component will give you a proof-of-concept within half a day. When you are not used to PSoCs it will take a bit longer to study the required documentation.
We don't need a bluetooth low energy functionality
We need a cpacitive touch slider 7 level with LEd indication from that we can get the touch data via I2C communication and it is communicated with another micro controller and LED driver, we have do to the logic of LED brightness control through PWM control