Hi,

Jitendra rana said:

1. our requirement 3 x 1Gbps RGMII ethernet port for simultaneously data transfer. these will not used for internet connection but for data transfer from one board to another board.

You can use DRA821 as it has 4 external ports can support 1Gbps RGMII link on each port.

Jitendra rana said:

2. It is video live stream data that will be input at one ethernet port of DRA821U-Q1 and there will be some video processing & IP address change, after these activities data will send to another ethernet port of DRA821U-Q1 processor for out then it will be send another board's ethernet port for display. is this processor capable to processing these activities. please let me know.

What is throughput requirement for your use case.
Please find the throughput numbers of CPSW5G application using R5F core with FreeRTOS.
https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-j7200/10_01_00_04/exports/docs/pdk_j7200_10_01_00_25/docs/datasheet/j7200/datasheet_j7200.html#cpsw-5g

Also, find the throughput numbers of CPSW5G using A72 core with Linux.
software-dl.ti.com/.../Release_Specific_Performance_Guide.html

Jitendra rana said:

3. Please share evaluation board, schematic and design file details link for the same. 

Please find details about the DRA821 from below Link. It has H/W Evaluation board and S/W information also.
https://www.ti.com/product/DRA821U

Best Regards,
Sudheer.