How can i receive video feed from my hardware video switcher to my pc live
You're doing it wrong.  Key from your effects source on to your live video with the switcher.  You will get much lower latency and better performance.  Alpha keying is ideal if your switcher supports it, but depending on what you are doing, luma keying (or less likely chroma keying) may also work.

There are a select few situations that may actually merit running the video through the computer as a filter, but they are pretty few and far between and most likely don't apply here.