A system for video processing, comprising: an input port configured to receive a first video from a camera; an output port configured to output a second video; one or more storage media including a set of instructions for modifying the first video; one or more video processors including one or more internal cache memory and in communication with the one or more storage media, wherein when executing the set of instructions, the one or more video processors: obtain the first video from the camera; obtain at least one operation parameter relating to the camera from the input port, the at least one operation parameter including at least one of a view angle of the camera or an orientation of the camera; generate a view angle image based on the at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter, characterized in that to generate the view angle image, the one or more video processors are configured to: judge whether a change of the at least one operation parameter is a normal change or an abnormal change, wherein the abnormal change refers to that the camera did not responded to instructions to achieve the change of the at least one operation parameter; in response to determining that the change of the at least one operation parameter is the normal change, generate the view angle image based on the changed at least one operation parameter, the view angle image graphically illustrating the changed at least one operation parameter; in response to determining that the change of the at least one operation parameter is the abnormal change, generate the view angle image based on the at least one operation parameter before change and the changed at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter before change and the changed at least one operation parameter; reconstruct the second video by combining contents of the view angle image and the first video; and send the second video to the output port. an input port configured to receive a first video from a camera; an output port configured to output a second video; one or more storage media including a set of instructions for modifying the first video; one or more video processors including one or more internal cache memory and in communication with the one or more storage media, wherein when executing the set of instructions, the one or more video processors: obtain the first video from the camera; obtain at least one operation parameter relating to the camera from the input port, the at least one operation parameter including at least one of a view angle of the camera or an orientation of the camera; generate a view angle image based on the at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter, obtain the first video from the camera; obtain at least one operation parameter relating to the camera from the input port, the at least one operation parameter including at least one of a view angle of the camera or an orientation of the camera; generate a view angle image based on the at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter, characterized in that to generate the view angle image, the one or more video processors are configured to: judge whether a change of the at least one operation parameter is a normal change or an abnormal change, wherein the abnormal change refers to that the camera did not responded to instructions to achieve the change of the at least one operation parameter; in response to determining that the change of the at least one operation parameter is the normal change, generate the view angle image based on the changed at least one operation parameter, the view angle image graphically illustrating the changed at least one operation parameter; in response to determining that the change of the at least one operation parameter is the abnormal change, generate the view angle image based on the at least one operation parameter before change and the changed at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter before change and the changed at least one operation parameter; judge whether a change of the at least one operation parameter is a normal change or an abnormal change, wherein the abnormal change refers to that the camera did not responded to instructions to achieve the change of the at least one operation parameter; in response to determining that the change of the at least one operation parameter is the normal change, generate the view angle image based on the changed at least one operation parameter, the view angle image graphically illustrating the changed at least one operation parameter; in response to determining that the change of the at least one operation parameter is the abnormal change, generate the view angle image based on the at least one operation parameter before change and the changed at least one operation parameter, the view angle image graphically illustrating the at least one operation parameter before change and the changed at least one operation parameter; reconstruct the second video by combining contents of the view angle image and the first video; and send the second video to the output port.