One big factor is what brand/model laptop do you have? If it has a Thunderbolt port, then bringing in video from the two Canon G21 shouldn't be a problem. You need a Thunderbolt capture device with at least 2 inputs. Or you can get an Sonnet or Akitio Thunderbolt enclosure and add your own capture device (see vMix Recommended Hardware). No Thunderbolt port would mean two separate USB capture dongles such as the Magewell USB Capture HDMI Gen 2. Capturing two cameras at 1080p/60 may cause an issue with your laptop.

For the camera that is 50 meters away, you could use an HDBaseT HDMI over CAT5e/CAT6 extender. The 225 meter run will be a bit more challenging. Though you could do it with cabling, you may want to explore a wireless solution. Take a look at the NewTek Connect Spark HDMI, which might be more convenient since it is all in one box.

vMix HD Basic only allows 4 inputs. With 2 cameras, audio from the announcer, that leaves only one more input.

Thank you for the information. It is really helpful. I appreciate it.

I discussed with cricket tournament organizer and they have given me a stand for live streaming in the outer middle of the ground.
Now the cable length is 120 meters for one camera and 120 meters for second camera from laptop.
Please advice me what kind of devices should I use like a good quality HDMI Extender will allow to use CAT5e/6 ethernet cable.

Capture device for 4 cameras. I will use 4 cameras in near future for the events.

Please assist me in this regard.

Kind Regards,