How many packets dropping rate is acceptable?

 

Below are the SLA parameters for Video and Voice. 

Transport network SLAs for video quality

Recommended network SLA for video[4] is as follows:

• Latency ≤ 150–300ms
• Jitter ≤ 10 ms–50ms
• Loss ≤ 0.5%

Incidentally the recommended network SLA for transporting audio are:

• Latency ≤ 150–300ms
• Jitter ≤ 20 ms–50ms
• Loss ≤ 1%

Please refer below link for more details

https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-video/212134-Video-Quality-of-Service-QOS-Tutorial.html